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1. Reconfigurable localized effects in non-Hermitian phononic plate

Author

Zhong, Wenxin, Cai, Runcheng, Zhuang, Xiaoying, Rabczuk, Timon, Pennec, Yan, Djafari-Rouhani, Bahram, Jin, Yabin, Tongji University, Physique - IEMN [PHYSIQUE - IEMN], Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN], Physique - IEMN (PHYSIQUE - IEMN), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), and This work was supported by the National Natural Science Foundation of China (No. 12272267), the Young Elite Scientists Sponsorship Program by CAST (2021QNRC001), the Shanghai Science and Technology Committee (Grant Nos. 22JC1404100 and 21JC1405600), and the Fundamental Research Funds for theCentral Universities.

Subjects
[PHYS]Physics [physics], [SPI]Engineering Sciences [physics]
Abstract

International audience; Skin effect is one of the intriguing phenomena exhibited by non-Hermitian wave systems. It reflects the localization of the modes at the boundaries of the structure. We demonstrated the skin effect for elastic waves propagating in a non-Hermitian phononic plate containing piezoelectric components in their unit cells. The latter behave as sensors and actuators by using the direct and inverse piezoelectric effects. The demonstration is based on the calculation of the complex non-reciprocal dispersion curves and their analysis for any direction of the wavevector in the two-dimensional space. Therefore, localization phenomena at different boundaries and corners of a finite square structure are presented. Furthermore, by applying different levels of non-Hermiticity in different parts of a square structure, it is shown that the localized features can appear at different positions and with various shapes. These localized phenomena can be reconfigured by acting on the non-Hermiticity parameters. Our results provided a feedback control strategy to introduce the non-Hermitian skin effect in two-dimensional elastic systems for potential applications, such as vibration control, energy harvesting, and sensing.

Published
2023

2. Hermitian and non-Hermitian Weyl physics in synthetic three-dimensional piezoelectric phononic beams

Author

Liangshu He, Yan Li, Bahram Djafari-Rouhani, Yabin Jin, Tongji University, School of Aerospace Engineering and Applied Mechanics, Northwest University (Xi'an), Physique - IEMN (PHYSIQUE - IEMN), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), ACKNOWLEDGMENTSThis paper is supported by the National Natural Science Foundation of China (Grant No. 12272267), theYoung Elite Scientists Sponsorship Program by CAST(Grant No. 2021QNRC001), and the Shanghai Science andTechnology Committee (Grants No. 22JC1404100 and No.21JC1405600), the program for the professor of specialappointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, the Fundamental Research Funds for the Central Universities., Physique - IEMN [PHYSIQUE - IEMN], and Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]

Subjects
General Physics and Astronomy, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics
Abstract

International audience; Recently, the evolution of the Weyl point (WP) caused by the introduction of nonhermiticity into Weyl semimetals has aroused great research interest. We consider elastic flexural wave propagation in a phononic beam containing piezoelectric materials and introduce nonhermiticity through active regulation of external circuits. Considering a synthetic parameter space constituted by the one-dimensional Bloch wave vector and two geometrical parameters, we demonstrate that a double WP (DWP) arises at the band crossing. Then we study its evolution from the hermitic to nonhermitic situation under the effect of the active piezoelectric materials. We find that the DWP in the hermitic case evolves into a Weyl degenerate line and a Weyl hollow ring as concerns the real and imaginary parts of the Weyl frequencies, respectively. The formation mechanisms of the DWPs, lines, and rings are explained through the Hamiltonian of the system. Further, we observe the changes of the DWP and degenerate line in the transmission spectra of finite structures. Finally, we discuss the synthetic Fermi arc interface states through the analysis of the reflected phase vortices. In this paper, we provide insights into the high-dimensional Hermitian and non-Hermitian physics in elastic wave systems using synthetic dimensions.

Published
2023

3. Modeling of spin decoherence in a Si hole qubit perturbed by a single charge fluctuator

Author

Baker Shalak, Christophe Delerue, Yann-Michel Niquet, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Physique - IEMN (PHYSIQUE - IEMN), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Laboratory of Atomistic Simulation (LSIM), Modélisation et Exploration des Matériaux (MEM), Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA), ANR-18-CE47-0007,MAQSi,Modélisation des bits quantiques silicium(2018), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN], Physique - IEMN [PHYSIQUE - IEMN], and Laboratory of Atomistic Simulation [LSIM]

Subjects
[PHYS]Physics [physics], Quantum Physics, Condensed Matter - Mesoscale and Nanoscale Physics, Quantum information, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), FOS: Physical sciences, FET, Qubit, Modelling & simulation, Quantum Physics (quant-ph)
Abstract

International audience; Spin qubits in semiconductor quantum dots are one of the promizing devices to realize a quantum processor. A better knowledge of the noise sources affecting the coherence of such a qubit is therefore of prime importance. In this work, we study the effect of telegraphic noise induced by the fluctuation of a single electric charge. We simulate as realistically as possible a hole spin qubit in a quantum dot defined electrostatically by a set of gates along a silicon nanowire channel. Calculations combining Poisson and time-dependent Schr\"odinger equations allow to simulate the relaxation and the dephasing of the hole spin as a function of time for a classical random telegraph signal. We show that dephasing time $T_2$ is well given by a two-level model in a wide range of frequency. Remarkably, in the most realistic configuration of a low frequency fluctuator, the system has a non-Gaussian behavior in which the phase coherence is lost as soon as the fluctuator has changed state. The Gaussian description becomes valid only beyond a threshold frequency $\omega_{th}$, when the two-level system reacts to the statistical distribution of the fluctuator states. We show that the dephasing time $T_{2}(\omega_{th})$ at this threshold frequency can be considerably increased by playing on the orientation of the magnetic field and the gate potentials, by running the qubit along "sweet" lines. However, $T_{2}(\omega_{th})$ remains bounded due to dephasing induced by the non-diagonal terms of the stochastic perturbation Hamiltonian. Our simulations reveal that the spin relaxation cannot be described cleanly in the two-level model because the coupling to higher energy hole levels impacts very strongly the spin decoherence. This result suggests that multi-level simulations including the coupling to phonons should be necessary to describe the relaxation phenomenon in this type of qubit.

Published
2023

4. Flat band induced topological photonic Tamm states in stubbed structures:Theory and experiment

Author

Soufyane Khattou, Yamina Rezzouk, Mohamed El Ghafiani, Madiha Amrani, Mohammed Elaouni, El Houssaine El Boudouti, Abdelkrim Talbi, Abdellatif Akjouj, Bahram Djafari-Rouhani, Université Mohammed Premier [Oujda], University of Mohammed I - Université Mohammed Premier, Acoustique Impulsionnelle & Magnéto-Acoustique Non linéaire - Fluides, Interfaces Liquides & Micro-Systèmes - IEMN [AIMAN-FILMS - IEMN], Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN], Physique - IEMN [PHYSIQUE - IEMN], Laboratoire International associé sur les phénomènes Critiques et Supercritiques en électronique fonctionnelle, acoustique et fluidique (LIA LICS/LEMAC), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Acoustique Impulsionnelle & Magnéto-Acoustique Non linéaire - Fluides, Interfaces Liquides & Micro-Systèmes - IEMN (AIMAN-FILMS - IEMN), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Physique - IEMN (PHYSIQUE - IEMN), and no information found

Subjects
[PHYS]Physics [physics], [SPI]Engineering Sciences [physics]
Abstract

International audience; We provide theoretical and experimental evidence for the existence of topological Tamm states at the interface between two stubbed photonic crystals (PCs) as a function of the period and length of the stubs. Several works have addressed these states in the well-known Su-Schrieffer-Heeger model, a dimerized chain based on two resonators per unit cell where the opening of a gap at a Dirac cone results in a symmetry inversion of bulk bands between two topologically different crystals. Here, we give a detailed theoretical analysis of a mechanism based on band-edge symmetry inversion around a flat band, i.e., when the width of the pass band vanishes, while using only one resonator (stub) per unit cell. Then, we propose a simple versatile experimental platform to observe such interface states, which is based on coaxial cables operating in the radio-frequency domain. The investigation of these states was performed by using different approaches: (i) the topology of the bands based on the Zak phase and the symmetry of the band-edge modes, (ii) the sign of the reflection phase between each PC and a waveguide, and (iii) the dips or peaks in the reflection and transmission spectra when two finite photonic crystals are connected together either horizontally or vertically along a waveguide. Furthermore, we give a general rule about the existence of interface states when two PCs exhibit two common gaps with a flat band in their middle and different bulk-edge symmetries. Also, we provide closed-form expressions of the geometrical parameters and the frequency for which the interface state becomes bound state in the continuum (BIC). We show that these topological BIC states are stationary states of the cavity between the two PCs, and are very robust to any perturbation on both sides of the cavity. Finally, we show the impossibility of existence of interface states between two PCs with identical periods and different stubs. The theoretical and experimental results are discussed for both Neumann and Dirichlet boundary conditions at the end of the stubs.

Published
2023

5. Emerging topics in nanophononics and elastic, acoustic, and mechanical metamaterials: An overview

Author

Anastasiia O. Krushynska, Daniel Torrent, Alejandro M. Aragón, Raffaele Ardito, Osama R. Bilal, Bernard Bonello, Federico Bosia, Yi Chen, Johan Christensen, Andrea Colombi, Steven A. Cummer, Bahram Djafari-Rouhani, Fernando Fraternali, Pavel I. Galich, Pedro David Garcia, Jean-Philippe Groby, Vincent Tournat, Sebastien Guenneau, Michael R. Haberman, Mahmoud I. Hussein, Shahram Janbaz, Noé Jiménez, Abdelkrim Khelif, Vincent Laude, MohammadJ.Mirzaali, Pawel Packo, Antonio Palermo, Yan Pennec, Rubén Picó, María Rosendo López, Stephan Rudykh, Marc Serra-Garcia, Clivia M. Sotomayor Torres, Timothy A. Starkey, Oliver B. Wright, University of Groningen [Groningen], Universitat Jaume I, University of Connecticut (UCONN), Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Politecnico di Torino = Polytechnic of Turin (Polito), Department of Applied Science and Technology [Politecnico di Torino] (DISAT), Institute of geographical sciences and natural resources research [CAS] (IGSNRR), Chinese Academy of Sciences [Beijing] (CAS), Universidad Carlos III de Madrid [Madrid] (UC3M), Institute of Structural Engineering [ETH Zürich] (IBK), Department of Civil, Environmental and Geomatic Engineering [ETH Zürich] (D-BAUG), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich)- Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Department of Electrical and Computer Engineering [Durham] (ECE), Duke University [Durham], Physique - IEMN (PHYSIQUE - IEMN), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), University of Salerno (UNISA), Abraham de Moivre, Imperial College London-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Acoustique de l'Université du Mans (LAUM), Le Mans Université (UM)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) (FEMTO-ST), Université de Technologie de Belfort-Montbeliard (UTBM)-Ecole Nationale Supérieure de Mécanique et des Microtechniques (ENSMM)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), This work is supported by the DYNAMO project (101046489) funded by the European Union. this publication is part of the project PID2021-124814NB-C22, funded by MCIN/AEI/10.13039/501100011033/ 'FEDER A way of making Europe'., University of Connecticut [UCONN], Institut des Nanosciences de Paris [INSP], Politecnico di Torino = Polytechnic of Turin [Polito], Department of Applied Science and Technology [Politecnico di Torino] [DISAT], Institute of geographical sciences and natural resources research [CAS] [IGSNRR], Universidad Carlos III de Madrid [Madrid] [UC3M], Institute of Structural Engineering [ETH Zürich] [IBK], Department of Electrical and Computer Engineering [Durham] [ECE], Physique - IEMN [PHYSIQUE - IEMN], Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN], University of Salerno [UNISA], Laboratoire d'Acoustique de l'Université du Mans [LAUM], Commissariat à l'énergie atomique et aux énergies alternatives [CEA], Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) [FEMTO-ST], Computational Mechanical and Materials Engineering, Krushynska A.O., Torrent D., Aragon A.M., Ardito R., Bilal O.R., Bonello B., Bosia F., Chen Y., Christensen J., Colombi A., Cummer S.A., Djafari-Rouhani B., Fraternali F., Galich P.I., Garcia P.D., Groby J.-P., Guenneau S., Haberman M.R., Hussein M.I., Janbaz S., Jimenez N., Khelif A., Laude V., Mirzaali M.J., Packo P., Palermo A., Pennec Y., Pico R., Lopez M.R., Rudykh S., Serra-Garcia M., Sotomayor Torres C.M., Starkey T.A., Tournat V., and Wright O.B.

Subjects
[PHYS]Physics [physics], Technology, metamaterial, EUROMECH, optomechanic, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, optomechanics, acoustic, mechanic, [SPI]Engineering Sciences [physics], metamaterials, Electrical and Electronic Engineering, acoustics, wave dynamics, ddc:600, nanophononics, additive manufacturing, mechanics, Biotechnology
Abstract

This broad review summarizes recent advances and "hot"research topics in nanophononics and elastic, acoustic, and mechanical metamaterials based on results presented by the authors at the EUROMECH 610 Colloquium held on April 25-27, 2022 in Benicássim, Spain. The key goal of the colloquium was to highlight important developments in these areas, particularly new results that emerged during the last two years. This work thus presents a "snapshot"of the state-of-the-art of different nanophononics- and metamaterial-related topics rather than a historical view on these subjects, in contrast to a conventional review article. The introduction of basic definitions for each topic is followed by an outline of design strategies for the media under consideration, recently developed analysis and implementation techniques, and discussions of current challenges and promising applications. This review, while not comprehensive, will be helpful especially for early-career researchers, among others, as it offers a broad view of the current state-of-the-art and highlights some unique and flourishing research in the mentioned fields, providing insight into multiple exciting research directions., Nanophotonics, 12 (4), ISSN:2192-8614

Published
2023

6. Theoretical Study of Gold Nanoparticles Randomly Dispersed on a Dielectric/Gold Substrate

Author

Saison-Francioso, Ophélie, Lévêque, Gaëtan, Akjouj, Abdellatif, Pennec, Yan, Physique - IEMN [PHYSIQUE - IEMN], Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN], Physique - IEMN (PHYSIQUE - IEMN), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), The authors thank the French National Research Agency ANR, as part of the project 'RANDOM' (reference ANR-19-CE24-0014), for financial support., and ANR-19-CE24-0014,RANDOM,Surface PhoXonique Aléatoire(2019)

Subjects
[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics
Abstract

International audience; We theoretically study random arrangements of cylindrical gold nanoparticles (NPs) deposited on a dielectric/gold substrate. We use two methods, namely the Finite Element Method (FEM) and the Coupled Dipole Approximation (CDA) method. The FEM is increasingly used to analyze the optical properties of NPs, but calculations for arrangements containing a large number of NPs have a high computational cost. On the contrary, the CDA has the advantage to drastically reduce the computation time and the memory demand compared to the FEM. Nevertheless, as the CDA involves modeling each NP as a single electric dipole through the polarizability tensor of a spheroidal-shaped NP, it may be an insufficiently accurate method. Therefore, the main purpose of this article is to verify the validity of using the CDA in order to analyze such a kind of nanosystems. Finally, we capitalize on this methodology to draw some tendencies between statistics of NPs’ distributions and the plasmonic properties.

Published
2023

7. Effect of electronic stopping in molecular dynamics simulations of collision cascades in gallium arsenide

Author

Johannes L. Teunissen, Thomas Jarrin, Nicolas Richard, Natalia E. Koval, Daniel Muñoz Santiburcio, Jorge Kohanoff, Emilio Artacho, Fabrizio Cleri, Fabiana Da Pieve, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN], Laboratoire Matière sous Conditions Extrêmes [LMCE], Queen's University [Belfast] [QUB], Cavendish Laboratory, Ikerbasque - Basque Foundation for Science, Physique - IEMN [PHYSIQUE - IEMN], Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Royal Belgian Institute for Space Aeronomy, Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire Matière sous Conditions Extrêmes (LMCE), DAM Île-de-France (DAM/DIF), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, CIC NanoGUNE BRTA, Departamento de Ingeniería Energética and Instituto de Fusión Nuclear 'Guillermo Velarde', Universidad Politécnica de Madrid (UPM), Queen's University [Belfast] (QUB), Donostia International Physics Center (DIPC), University of the Basque Country/Euskal Herriko Unibertsitatea (UPV/EHU), University of Cambridge [UK] (CAM), Physique - IEMN (PHYSIQUE - IEMN), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), and European Project: 776410,H2020,H2020-COMPET-2017,ESC2RAD(2018)

Subjects
Condensed Matter - Materials Science, Physics and Astronomy (miscellaneous), Radiation damage, Scattering of atoms, molecules, clusters & ions, Condensed Matter, Materials & Applied Physics, Nuclear Physics, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, Computational Physics (physics.comp-ph), General Materials Science, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Physics - Computational Physics
Abstract

International audience; Understanding the generation and evolution of defects induced in matter by ion irradiation is of fundamental importance to estimate the degradation of functional properties of materials. Computational approaches used in different communities, from space radiation effects to nuclear energy experiments, are based on a number of approximations that, among others, traditionally neglect the coupling between electronic and ionic degrees of freedom in the description of displacements. In this work, we study collision cascades in GaAs, including the electronic stopping power for self-projectiles in different directions obtained via real-time time-dependent density functional theory in molecular dynamics simulations of collision cascades, using the recent electron-phonon model and the previously developed two-temperature model. We show that the former can be well applied to describe the effects of electronic stopping in molecular dynamics simulations of collision cascades in a multielement semiconductor and that the number of defects is considerably affected by electronic stopping effects. The results are also discussed in the wider context of the commonly used nonionizing energy loss model to estimate degradation of materials by cumulative displacements.

Published
2023

8. Robust Fano resonance between mechanical first- and second-order topological states

Author

Linyun Yang, Ying Wu, Kaiping Yu, Rui Zhao, Wei Wang, Bernard Bonello, Bahram Djafari-Rouhani, Harbin Institute of Technology (HIT), Nanjing University of Science and Technology (NJUST), Peking University [Beijing], University of Chinese Academy of Sciences [Beijing] (UCAS), Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Physique - IEMN (PHYSIQUE - IEMN), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Y. W. acknowledges the support from China Postdoctoral Science Foundation (No. 2020M672615). R. Z. acknowledges the financial support from the National Natural Science Foundation of China (Grant No. 12102103)., Harbin Institute of Technology [HIT], Nanjing University of Science and Technology [NJUST], University of Chinese Academy of Sciences [Beijing] [UCAS], Institut des Nanosciences de Paris [INSP], Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN], and Physique - IEMN [PHYSIQUE - IEMN]

Subjects
[SPI]Engineering Sciences [physics], Mechanics of Materials, Mechanical Engineering, General Materials Science, Condensed Matter Physics, Civil and Structural Engineering
Abstract

International audience; The Fano resonance, as a phenomenon of wave scattering, is based on the interaction between a “bright mode” and a “dark mode” giving rise to an asymmetric and ultrasharp spectral peak. However, the Fano resonant frequency is sensitive to structural imperfections such as defects or disorders, which will shift the resonant peak, or even damage the Fano line shape. Here, we harness the coupling between the first-order and the higher-order topological insulators to overcome this shortcoming. We construct a first-order topological edge state to serve as a bright mode, and a second-order topological corner state to be the dark mode using the same base configuration. As a result, a topological Fano resonance is expected to occur around the resonant frequency of the dark mode. The robustness of the Fano resonance is verified by deliberately introducing various types of imperfections into the system. Our findings may further enhance confidence in using the resonance such as acoustic switching, refractive index sensing, high quality factor filters, and accurate interferometers.

Published
2022

9. Optomechanical hot-spots in metallic nanorod-polymer nanocomposites

Author

Thomas Vasileiadis, Adnane Noual, Yuchen Wang, Bartlomiej Graczykowski, Bahram Djafari-Rouhani, Shu Yang, George Fytas, Max Planck Society, Adam Mickiewicz University in Poznań (UAM), University of Mohammed I - Université Mohammed Premier, University of Pennsylvania, Max Planck Institute for Polymer Research, Max-Planck-Gesellschaft, Physique - IEMN (PHYSIQUE - IEMN), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Institute of Electronic Structure and Laser (FORTH-IESL), Foundation for Research and Technology - Hellas (FORTH), This project has received funding from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie Action Grant Agreement 101003436 – PLASMMONS. G.F. acknowledges the support by ERC AdG SmartPhon (Grant 694977). T.V. acknowledges the financial support from the Polish National Science Centre (No. UMO-2021/43/D/ST3/02526). B.G. acknowledges the financial support from the Polish National Science Centre (No. UMO-2018/31/D/ST3/03882). B.D.R. and A.N. acknowledge the computer facilities provided by the group ephoni at Institut d’Electronique, Microélectronique and Nanotechnologie, University of Lille. S.Y. acknowledges the support by the National Science Foundation (NSF), DMR/Polymer program, No. DMR-210484. We thank Emerson Coy (NanoBioMedical Centre, Adam Mickiewicz University) for his assistance with the TEM measurements of Au NRs in PVA., European Project: 101003436,H2020,231361,PLASMMONS(2020), European Project: 694977,H2020,Small - and nano - scale soft phononics(2016), Adam Mickiewicz University in Poznań [UAM], Physique - IEMN [PHYSIQUE - IEMN], and Institute of Electronic Structure and Laser [FORTH-IESL]

Subjects
General Engineering, General Physics and Astronomy, Optomechanics, optomechanics, Nanocomposites, polymer nanocomposites, Brillouin light scattering, plasmonic enhancement, elastic vibrations, nanorods, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Plasmonics, General Materials Science, Nanorods
Abstract

Experimental and computational study of optomechanical interactions in plasmonic nanorod - polymer nanocomposites. Plasmonic coupling between adjacent metallic nanoparticles can be exploited for acousto-plasmonics, single-molecule sensing, and photochemistry. Light absorption or electron probes can be used to study plasmons and their interactions, but their use is challenging for disordered systems and colloids dispersed in insulating matrices. Here, we investigate the effect of plasmonic coupling on optomechanics with Brillouin light spectroscopy (BLS) in a prototypical metal–polymer nanocomposite, gold nanorods (Au NRs) in polyvinyl alcohol. The intensity of the light inelastically scattered on thermal phonons captured by BLS is strongly affected by the wavelength of the probing light. When light is resonant with the transverse plasmons, BLS reveals mostly the normal vibrational modes of single NRs. For lower energy off-resonant light, BLS is dominated by coupled bending modes of NR dimers. The experimental results, supported by optomechanical calculations, document plasmonically enhanced BLS and reveal energy-dependent confinement of coupled plasmons close to the tips of NR dimers, generating BLS hot-spots. Our work establishes BLS as an optomechanical probe of plasmons and promotes nanorod–soft matter nanocomposites for acousto-plasmonic applications. This project has received funding from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie Action Grant Agreement 101003436 – PLASMMONS. G.F. acknowledges the support by ERC AdG SmartPhon (Grant 694977). T.V. acknowledges the financial support from the Polish National Science Centre (No. UMO-2021/43/D/ST3/02526). B.G. acknowledges the financial support from the Polish National Science Centre (No. UMO-2018/31/D/ST3/03882). B.D.R. and A.N. acknowledge the computer facilities provided by the group ephoni at Institut d’Electronique, Microélectronique and Nanotechnologie, University of Lille. S.Y. acknowledges the support by the National Science Foundation (NSF), DMR/Polymer program, No. DMR-210484.

Published
2022

10. Tunable Topological Acoustic Tamm States in Comblike Structures Based on Band Inversion around Flat Bands

Author

Soufyane Khattou, Yamina Rezzouk, Madiha Amrani, Mohamed El Ghafiani, El Houssaine El Boudouti, Abdelkrim Talbi, Bahram Djafari-Rouhani, Université Mohammed Premier [Oujda], University of Mohammed I - Université Mohammed Premier, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Acoustique Impulsionnelle & Magnéto-Acoustique Non linéaire - Fluides, Interfaces Liquides & Micro-Systèmes - IEMN (AIMAN-FILMS - IEMN), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Physique - IEMN (PHYSIQUE - IEMN), This research received no external funding.The work of S. Khattou, Y. Rezzouk, M. Amrani and M. El Ghafiani was supported by the National Center of Scientific and Technical Research (CNRST) under the Excellence scholarship of Research., Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN], Acoustique Impulsionnelle & Magnéto-Acoustique Non linéaire - Fluides, Interfaces Liquides & Micro-Systèmes - IEMN [AIMAN-FILMS - IEMN], and Physique - IEMN [PHYSIQUE - IEMN]

Subjects
Inorganic Chemistry, [PHYS]Physics [physics], [SPI]Engineering Sciences [physics], General Chemical Engineering, General Materials Science, Condensed Matter Physics, topological interface states, phononic crystals, comblike structure, Zak phase
Abstract

International audience; We investigate the existence of acoustic Tamm states at the interface between two one-dimensional (1D) comblike phononic crystals (PnCs) based on slender tubes and discuss their topological or trivial character. The PnCs consist of stubs grafted periodically along a waveguide and the two crystals differ by their geometrical parameters (period and length of the stubs). We use several approaches to discuss the existence of Tamm states and their topology when connecting two half-crystals. First, we derive a necessary and sufficient condition on the existence of interface states based on the analysis of the bulk band structure and the symmetry of the band edge states. This approach is equivalent to an analysis of the Zak phases of the bulk bands in the two crystals. Indeed, a topological interface state should necessarily exist in any common bandgap of the two PnCs for which the lower (upper) band edges have opposite symmetries. A novelty of our structure consists in the fact that the symmetry inversion results from a band closure (flat band) rather than from a gap closure, in contrast to previous works. Then, such interface states are revealed through different physical quantities, namely: (i) the local density of states (LDOS), which exhibits a high localization around the interface; (ii) sharp peaks in the transmission spectra in the common bandgap when two finite crystals are connected together; (iii) the phases of the reflection coefficients at the boundary of each PnC with a waveguide, which have a direct relationship with the Zak phases. In addition, we show that the interface states can transform to bound states in the continuum (BICs). These BICs are induced by the cavity separating both PnCs and they remain robust to any geometrical disorder induced by the stubs and segments around this cavity. Finally, we show the impossibility of interface states between two connected PnCs with different stub lengths and similar periods. The sensitivity of these states to interface perturbations can find many practical applications in PnC sensors.

Published
2022

11. Bound states in the continuum in circular clusters of scatterers

Author

Marc Martí-Sabaté, Bahram Djafari-Rouhani, Dani Torrent, Institut de Noves Tecnologies de la Imatge (INIT), Universitat Jaume I, Physique - IEMN (PHYSIQUE - IEMN), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), ACKNOWLEDGMENTS D.T. acknowledges financial support through a 'Ramón y Cajal' fellowship, under Grant No. RYC-2016-21188.This research was supported by the DYNAMO project (101046489), funded by the European Union, but the views and opinions expressed are, however, those of the authors only and do not necessarily reflect those of the European Union or the European Innovation Council. Neither the European Union nor the granting authority can be held responsible for them. M.M.-S. acknowledges financial support through the FPU program under Grant No. FPU18/02725. This publication is part of Project No. PID2021-124814NB-C22, funded by MCIN/AEI/10.13039/501100011033, 'FEDER, A way of making Europe., Institut de Noves Tecnologies de la Imatge [INIT], and Physique - IEMN [PHYSIQUE - IEMN]

Subjects
[PHYS]Physics [physics], Classical Physics (physics.class-ph), FOS: Physical sciences, General Physics and Astronomy, Applied Physics (physics.app-ph), Physics - Classical Physics, Physics - Applied Physics, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, Optics (physics.optics), Physics - Optics
Abstract

International audience; ABSTRACTIn this work we study the localization of flexural waves in highly symmetric clusters of scatterers. It is shown that when the scatterers are placed regularly in the perimeter of a circumference, the quality factor of the resonances strongly increases with the number of scatterers in the cluster. It is also found that in the continuous limit, that is to say, when the number of scatterers tends to infinite, the quality factor is infinite so that the modes belong to the class of the so-called bound states in the continuum or BICs, and an analytical expression for the resonant frequency is found. These modes have different multipolar symmetries, and we show that for high multipolar orders the modes tend to localize at the border of the circumference, therefore forming a whispering gallery mode with an extraordinarily high quality factor. Numerical experiments are performed to check the robustness of these modes under different types of disorder and also to study their excitation from the far field. Although we have focused our study on flexural waves, the methodology presented in this work can be applied to other classical waves, like electromagnetic or acoustic waves, being a promising approach for the design of high-quality resonators based on finite clusters of scatterers.

Published
2022

12. Elastic metasurface made of elliptic shape pillars for acoustic wave focusing

Author

Djafari-Rouhani, B. (Bahram), Carpentier, L. (Laurent), Pennec, Y. (Yan), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Physique - IEMN (PHYSIQUE - IEMN), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), This work was supported by the French National Research Agency ANR as part of the project 'RANdom', ANR-19-CE24-0014., ANR-19-CE24-0014,RANDOM,Surface PhoXonique Aléatoire(2019), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN], and Physique - IEMN [PHYSIQUE - IEMN]

Subjects
focusing, metasurface, [SPI]Engineering Sciences [physics], elastic wave, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph]
Abstract

International audience; We numerically propose the design of a metasurface for focusing the flexural Lamb waves propagating on a plate. The metasurface consists of a line of pillars of elliptic shape with a gradient in their ellipticity. We first determine an elliptic pillar that allows the superposition of two resonances (one compresional and one bending) in order to obtain a phase shift of 2π around the resonance. Then, the metasurface is built by chosing the ellipticity of each pillar at a given position based on the generalized Snell's law for the selected focal point. We demonstrate the capacity of this design for subwavelength focusing of the incident plane wave at any targeted point.

Published
2022

13. Engineering a Robust Flat Band in III–V Semiconductor Heterostructures

Author

Xavier Wallart, Daniel Vanmaekelbergh, Gilles Patriarche, David Troadec, Guillaume Fleury, Bruno Grandidier, Christophe Delerue, Nathali Alexandra Franchina Vergel, Maxime Berthe, Ludovic Desplanque, C. Coinon, Yannick Lambert, Tao Xu, François Vaurette, Davide Sciacca, Dmitri A. Yarekha, L. Christiaan Post, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Debye Institute for Nanomaterials Science, Utrecht University [Utrecht], Laboratoire de Chimie des Polymères Organiques (LCPO), Université de Bordeaux (UB)-Ecole Nationale Supérieure de Chimie, de Biologie et de Physique (ENSCBP)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Team 4 LCPO : Polymer Materials for Electronic, Energy, Information and Communication Technologies, Université de Bordeaux (UB)-Ecole Nationale Supérieure de Chimie, de Biologie et de Physique (ENSCBP)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Bordeaux (UB)-Ecole Nationale Supérieure de Chimie, de Biologie et de Physique (ENSCBP)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Centre de Nanosciences et de Nanotechnologies (C2N), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Sino-European School of Technology, University of Shanghai [Shanghai], Physique - IEMN (PHYSIQUE - IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Centrale de Micro Nano Fabrication - IEMN (CMNF - IEMN), EPItaxie et PHYsique des hétérostructures - IEMN (EPIPHY - IEMN), Dutch Research Council (NWO Chemistry - Toppunt 'Superficial superstructures'), Natural Science Foundation of Shanghai (19ZR1419500), Renatech Network, PCMP PCP, ANR-16-CE24-0007,Dirac-III-V,Super-réseau d'antipoints de Dirac pour les électrons dans les semiconducteurs III-V(2016), ANR-11-EQPX-0015,Excelsior,Centre expérimental pour l'étude des propriétés des nanodispositifs dans un large spectre du DC au moyen Infra-rouge.(2011), ANR-17-CE09-0021,GERMANENE,Croissance de germanene sur substrats à bande interdite(2017), European Project: FIRST STEP, Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Ecole Nationale Supérieure de Chimie, de Biologie et de Physique (ENSCBP)-Université de Bordeaux (UB)-Institut de Chimie du CNRS (INC), Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Ecole Nationale Supérieure de Chimie, de Biologie et de Physique (ENSCBP)-Université de Bordeaux (UB)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Ecole Nationale Supérieure de Chimie, de Biologie et de Physique (ENSCBP)-Université de Bordeaux (UB)-Institut de Chimie du CNRS (INC), Physique-IEMN (PHYSIQUE-IEMN), and Centrale de Micro Nano Fabrication - IEMN (CMNF-IEMN)

Subjects
Materials science, tight binding calculations, quantum well, flat band, Scanning tunneling spectroscopy, band engineering, Bioengineering, 02 engineering and technology, Electron, Lattice constant, General Materials Science, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Electronic band structure, Lithography, ComputingMilieux_MISCELLANEOUS, Quantum well, block copolymer lithography, business.industry, Mechanical Engineering, Heterojunction, disorder, General Chemistry, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Two-dimensional lattice, Quantum dot, scanning tunneling spectroscopy, Optoelectronics, III−V semiconductor, 0210 nano-technology, business
Abstract

Electron states in semiconductor materials can be modified by quantum confinement. Adding to semiconductor heterostructures the concept of lateral geometry offers the possibility to further tailor the electronic band structure with the creation of unique flat bands. Using block copolymer lithography, we describe the design, fabrication, and characterization of multiorbital bands in a honeycomb In0.53Ga0.47As/InP heterostructure quantum well with a lattice constant of 21 nm. Thanks to an optimized surface quality, scanning tunnelling spectroscopy reveals the existence of a strong resonance localized between the lattice sites, signature of a p-orbital flat band. Together with theoretical computations, the impact of the nanopatterning imperfections on the band structure is examined. We show that the flat band is protected against the lateral and vertical disorder, making this industry-standard system particularly attractive for the study of exotic phases of matter.

Published
2020

14. Effect of Damping on Magnetic Induced Resonances in Cross Waveguide Structures

Author

A. Mouadili, Abdellatif Akjouj, E. H. El Boudouti, Leonard Dobrzynski, H. Al-Wahsh, Bahram Djafari-Rouhani, University Mohammed 1 - Oujda, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique-IEMN (PHYSIQUE-IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Facultés des Sciences et Techniques de Mohammedia, Physique - IEMN (PHYSIQUE - IEMN), and Benha University (BU)

Subjects
010302 applied physics, Physics, Magnonic induced transparency, Electromagnetically induced transparency, Heisenberg model, Magnon, Resonance, Fano resonance, Condensed Matter Physics, 01 natural sciences, Molecular physics, Electronic, Optical and Magnetic Materials, Magnonic circuits, [SPI]Engineering Sciences [physics], Resonator, Q factor, 0103 physical sciences, Transmission, s function, Waveguide (acoustics), Magnonic induced absorption, 010306 general physics, Greenand#8217
Abstract

International audience; We consider, in the frame of long-wavelength Heisenberg model, a simple magnetic device consisting of two dangling side stubs grafted at the same site along a waveguide. This simple structure is designed to obtain bound in continuum (BIC) modes, magnonic induced transparency (MIT) and magnonic induced absorption (MIA), the analogues of electromagnetic induced transparency (EIT) and absorption (EIA) resonances respectively. By detuning the lengths of the two stubs, a resonance can be squeezed between two transmission zeros induced by the two resonators. We give detailed analytical expressions for the transmission and reflection coefficients as well as the absorption coefficient of the whole structure. A sharp peak with high Q factor is found as the consequence of the constructive interference of the waves in the two stubs. For some specific detuning values, the Q factor may reach infinity giving rise to the so-called bound in continuum state. Also, we give several explicit expressions for other physical characteristics, e.g., the transmission function close to the resonance, the position, the width and the Fano parameters of the resonances as a function of the difference between the lengths of the stubs. The reported analytical results are obtained by means of a Green's function method. These results should have important consequences for designing a selecting or rejecting magnon filter.

Published
2020

15. Historical and Foundational Details on the Method of Infinite Descent: Every Prime Number of the Form 4n + 1 is the Sum of Two Squares

Author

Raffaele Pisano, Paolo Bussotti, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique-IEMN (PHYSIQUE-IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), and Physique - IEMN (PHYSIQUE - IEMN)

Subjects
Fermat's theorem on sums of two squares, Of the form, Context (language use), Relationship logic-mathematics, 01 natural sciences, [SPI]Engineering Sciences [physics], Number theory, History and Philosophy of Science, Fermat, 0601 history and archaeology, 0101 mathematics, ComputingMilieux_MISCELLANEOUS, Foundations of mathematics, Mathematics, Fermat's Last Theorem, Proof by infinite descent, Multidisciplinary, 010102 general mathematics, Prime number, 06 humanities and the arts, Algebra, 060105 history of science, technology & medicine, History of mathematics, Infinite descent
Abstract

Pierre de Fermat (1601/7–1665) is known as the inventor of modern number theory. He invented–improved many methods useful in this discipline. Fermat often claimed to have proved his most difficult theorems thanks to a method of his own invention: the infinite descent (Fermat 1891–1922, II, pp. 431–436). He wrote of numerous applications of this procedure. Unfortunately, he left only one almost complete demonstration and an outline of another demonstration. The outline concerns the theorem that every prime number of the form 4n + 1 is the sum of two squares. In this paper, we analyse a recent proof of this theorem. It is interesting because: (1) it follows all the elements of which Fermat wrote in his outline; (2) it represents a good introduction to all logical nuances and mathematical variants concerning this method of which Fermat spoke. The assertions by Fermat will also be framed inside their historical context. Therefore, the aims of this paper are related to the history of mathematics and to the logic of proof-methods.

Published
2020

16. Probing Nanoparticle/Membrane Interactions by Combining Amphiphilic Diblock Copolymer Assembly and Plasmonics

Author

Tristan Bereau, Markus Deserno, Hans-Juergen Butt, George Fytas, Katharina Landfester, Gaëtan Lévêque, Amelie H. R. Koch, Svenja Morsbach, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique-IEMN (PHYSIQUE-IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Machine Learning Department [Carnegie Mellon Univ.], Carnegie Mellon University [Pittsburgh] (CMU), Institute of Electronic Structure and Laser (FORTH-IESL), Foundation for Research and Technology - Hellas (FORTH), ERC AdG SmartPhon [694977], NSFNational Science Foundation (NSF) [CHE 1764257], Max Planck Institute for Polymer Research, Max-Planck-Gesellschaft, Physique - IEMN (PHYSIQUE - IEMN), and Computational Science Lab (IVI, FNWI)

Subjects
Materials science, Polymers, Nanoparticle, Metal Nanoparticles, Nanotechnology, 010402 general chemistry, 01 natural sciences, Article, Citric Acid, Polyethylene Glycols, [SPI]Engineering Sciences [physics], Dynamic light scattering, 0103 physical sciences, Oxazines, Materials Chemistry, Surface charge, Dimethylpolysiloxanes, Physical and Theoretical Chemistry, Surface plasmon resonance, 010304 chemical physics, Vesicle, Adhesion, Surface Plasmon Resonance, 0104 chemical sciences, Surfaces, Coatings and Films, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, Membrane, [CHIM.POLY]Chemical Sciences/Polymers, Polymersome, Liposomes, Gold
Abstract

International audience; Understanding the interactions between nanoparticles (NPs) and boundaries of cells is crucial both for their toxicity and therapeutic applications. Besides specific receptor-mediated endocytosis of surface-functionalized NPs, passive internalization is prompted by relatively unspecific parameters, such as particle size and charge. Based on theoretical treatments, adhesion to and bending of the cell membrane can induce NP wrapping. Experimentally, powerful tools are needed to selectively probe possible membrane-NP motifs at very dilute conditions and avoid dye labeling. In this work, we employ surface resonance-enhanced dynamic light scattering, surface plasmon resonance, electron microscopy, and simulations for sensing interactions between plasmonic AuNPs and polymersomes. We distinguish three different interaction scenarios at nanomolar concentrations by tuning the surface charge of AuNPs and rationalize these events by balancing vesicle bending and electrostatic/van der Waals AuNP and vesicle adhesion. The clarification of the physical conditions under which nanoparticles passively translocate across membranes can aid in the rational design of drugs that cannot exploit specific modes of cellular uptake and also elucidates physical properties that render nanoparticles in the environment particularly toxic.

Published
2020

17. Sputtered tungsten nitride films as pseudocapacitive electrode for on chip micro-supercapacitors

Author

Pascal Roussel, Thierry Brousse, Didier Stiévenard, Saliha Ouendi, Kevin Robert, Christophe Lethien, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Centrale de Micro Nano Fabrication - IEMN (CMNF - IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Circuits Systèmes Applications des Micro-ondes - IEMN (CSAM - IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Institut TELECOM/TELECOM Lille1, Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Physique - IEMN (PHYSIQUE - IEMN), Institut des Matériaux Jean Rouxel (IMN), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Réseau sur le stockage électrochimique de l'énergie (RS2E), Université de Nantes (UN)-Aix Marseille Université (AMU)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Collège de France (CdF (institution))-Université de Picardie Jules Verne (UPJV)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Pau et des Pays de l'Adour (UPPA)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Université Grenoble Alpes (UGA), AcknowledgmentThis research is financially supported by the ANR within theDENSSCAPIO project (ANR-17-CE05-0015-02). The authors also want tothank the French network on electrochemical energy storage (RS2E) forthe financial support. The French RENATECH network is greatlyacknowledged for the use of microfabrication facilities. Associated Professor Dr Christophe Lethien wants to thank Professor Thierry Brousseand the 'Institut des Materiaux de Nantes' for welcoming him as avisiting professor in 2018. Jean Louis Codron and Xavier Wallart aregreatly acknowledged for the XPS measurements., Renatech Network, ANR-17-CE05-0015,DENSSCAPIO,Supercondensateurs nanostructurés tout-solides pour stockage d'énergie plus dense et plus sûr(2017), Centrale de Micro Nano Fabrication - IEMN (CMNF-IEMN), Physique-IEMN (PHYSIQUE-IEMN), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN), and Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille

Subjects
Materials science, Energy Engineering and Power Technology, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Capacitance, law.invention, [SPI]Engineering Sciences [physics], chemistry.chemical_compound, law, Microelectronics, General Materials Science, Wafer, Pseudocapacitance, Micro-supercapacitor, ComputingMilieux_MISCELLANEOUS, Supercapacitor, Renewable Energy, Sustainability and the Environment, business.industry, Sputtering, Sputter deposition, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Capacitor, chemistry, Electrode, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Tungsten nitride, Optoelectronics, AFM, 0210 nano-technology, business
Abstract

International audience; AbstractMicro-supercapacitors, a class of miniaturized electrochemical capacitors, are an attractive solution to power smart and connected sensors for Internet of Thing (IoT) applications. Unfortunately, to propose on chip micro-supercapacitors with high technological readiness level, the deposition of electrode materials on large-scale substrate is challenging from microelectronic industry point of view. To fulfill the IoT needs and semiconductor industry requirements, the sputtering deposition of transition metal nitride was investigated in the framework of this paper. Bi-functional tungsten nitride films were sputtered on silicon wafer and were investigated both as a current collector and as an electrode material. Atomic Force Microscopy technique was used to evaluate the specific surface of the sputtered films. 7.9 μm-thick W2N films exhibits a specific surface of 75 cm2 per cm2 footprint area and thus it exhibits capacitance values up to 0.55 F cm−2 and more than 700 F cm−3 in 1 M KOH aqueous electrolyte.

Published
2019

18. Room-Temperature Electron Transport in Self-Assembled Sheets of PbSe Nanocrystals with a Honeycomb Nanogeometry

Author

Alimoradi Jazi, Maryam, Kulkarni, Aditya, Sinai, Sophia Buhbut, Peters, Joep L, Geschiere, Eva, Failla, Michele, Delerue, Christophe, Houtepen, Arjan J, Siebbeles, Laurens D A, Vanmaekelbergh, Daniel, Sub Condensed Matter and Interfaces, Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science, Utrecht University [Utrecht], Optoelectronic Materials Section, Department of Chemical Engineering Delft University of Technology, Delft University of Technology (TU Delft), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique - IEMN (PHYSIQUE - IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Deparment of Chemistry, Opto-electronic materials section, DelftChemTech, ACKNOWLEDGMENTSM.A.J. acknowledges the H2020-MSCA-ITN-2014 Program'-Phonsi, (Nanophotonics by nanocrystals, from integration tosingle photon operation)' for financial support. A.K. acknowledges the Dutch FOM programme 'Designing Dirac carriers inhoneycomb semiconductor superlattices' (No. 67595) forfinancial support. D.V. acknowledges support by ERC researchcouncil, ERC-Advanced Grant 'First step' (No. 692691). A.J.H.acknowledges support from the European Research CouncilHorizon 2020 ERC Grant Agreement No. 678004 (Doping onDemand)., Physique-IEMN (PHYSIQUE-IEMN), Sub Condensed Matter and Interfaces, and Condensed Matter and Interfaces

Subjects
[PHYS]Physics [physics], Electron density, Electron mobility, Materials science, Terahertz radiation, business.industry, Carrier scattering, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Terahertz spectroscopy and technology, General Energy, Semiconductor, Nanocrystal, Monolayer, Optoelectronics, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Physical and Theoretical Chemistry, 0210 nano-technology, business, ComputingMilieux_MISCELLANEOUS
Abstract

It has been shown recently that atomically coherent superstructures of a nanocrystal monolayer in thickness can be prepared by self-assembly of monodisperse PbSe nanocrystals, followed by oriented attachment. Superstructures with a honeycomb nanogeometry are of special interest, as theory has shown that they are regular 2-D semiconductors, but with the highest valence and lowest conduction bands being Dirac-type, that is, with a linear energy-momentum relation around the K-points in the zone. Experimental validation will require cryogenic measurements on single sheets of these nanocrystal monolayer superstructures. Here, we show that we can incorporate these fragile superstructures into a transistor device with electrolyte gating, control the electron density, and measure the electron transport characteristics at room temperature. The electron mobility is 1.5 ± 0.5 cm2 V-1 s-1, similar to the mobility observed with terahertz spectroscopy on freestanding superstructures. The terahertz spectroscopic data point to pronounced carrier scattering on crystallographic imperfections in the superstructure, explaining the limited mobility.

Published
2019

19. Dynamical effective parameters of elastic superlattice with strong acoustic contrast between the constituents

Author

Yurii Zubov, Arkadii Krokhin, Bahram Djafari-Rouhani, University of North Texas (UNT), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique - IEMN (PHYSIQUE - IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), ACKNOWLEDGMENTSThis work is supported by an Emerging Frontiers inResearch and Innovation grant from the National ScienceFoundation (Grant No. 1741677)., and Physique-IEMN (PHYSIQUE-IEMN)

Subjects
Physics, Physics and Astronomy (miscellaneous), Condensed matter physics, Band gap, Superlattice, General Physics and Astronomy, Metamaterial, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Homogenization (chemistry), Layered structure, [SPI]Engineering Sciences [physics], Effective mass (solid-state physics), 0103 physical sciences, Електронні властивості низьковимірних систем, 010306 general physics, 0210 nano-technology, Elastic modulus, Bloch wave
Abstract

Analytical formulas are obtained for frequency-dependent effective elastic modulus and effective mass density for a periodic layered structure. The proposed homogenization procedure is valid at sufficiently high frequencies well above the lowest band gap in the acoustic spectrum of the structure. It is shown that frequencydependent effective parameters may take negative values either in different regions of frequencies or in the same quite narrow region. This property demonstrates that 1D elastic structure may behave in the limit of small Bloch wave vectors as a double-negative acoustic metamaterial. Отримано аналітичні формули для частотно-залежних ефективного модуля пружності та ефективної щільності періодичної шаруватої структури. Запропонована процедура гомогенізації справедлива при досить високих частотах, що перевищують частоту першої забороненої зони в акустичному спектрі структури. Показано, що залежні від частоти ефективні параметри можуть набувати від’ємних значень або в різних частотних областях, або в одній досить вузькій області. Ця властивість показує, що одновимірна пружна структура в межі малих блоховських хвильових векторів може поводитися як акустичний метаматериал, у якого обидва ефективні параметри від’ємні. Получены аналитические формулы для частотнозависимых эффективного модуля упругости и эффективной плотности периодической слоистой структуры. Предложенная процедура гомогенизации справедлива при достаточно высоких частотах, превышающих частоту первой запрещенной зоны в акустическом спектре структуры. Показано, что зависящие от частоты эффективные параметры могут принимать отрицательные значения либо в различных частотных областях, либо в одной достаточно узкой области. Данное свойство показывает, что одномерная упругая структура в пределе малых блоховских волновых векторов может вести себя как акустический метаматериал, у которого оба эффективных параметра отрицательны.

Published
2018

20. 15 - Silicon Nanowires and Nanopillars for Photovoltaic

Author

Pennec, Y., Akjouj, A., Lévêque, G., Djafari-Rouhani, B., Dobrzynski, L., Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique - IEMN (PHYSIQUE - IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), and Physique-IEMN (PHYSIQUE-IEMN)

Subjects
[PHYS]Physics [physics], Condensed Matter::Materials Science, [SPI]Engineering Sciences [physics], Physics::Optics
Abstract

International audience; We present simulations on both the optical properties and the efficiency of nanowires (NWs), nanopillars (NPs) and nanocones (NCs) silicon-based solar cells, together with measurements on their associated optical absorption. We address the calculation using Green's function formalism and Finite Difference Time Domain (FDTD) method, well-adapted to deal with a periodic set of nanostructures. We study the effect of the period, the bottom diameter, the top diameter, and the height of the NPs or NCs on the efficiency, assuming that one absorbed photon induces one exciton. We give general trends of the involved geometrical parameters with regard to the efficiency of the nanostructures' solar cell. Moreover, nanostructures have been processed and allow comparing experimental results with simulations. In every case, a good agreement has been found.

Published
2021

21. DNA aptamers block the receptor binding domain at the spike protein of SARS-CoV-2

Author

Fabrizio Cleri, Ralf Blossey, Marc F. Lensink, Université de Lille, CNRS, Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520, 1067373|||Physique - IEMN [PHYSIQUE - IEMN], Unité de Glycobiologie Structurale et Fonctionnelle (UGSF) - UMR 8576, 1001889|||Unité de Glycobiologie Structurale et Fonctionnelle [UGSF], Unité de Glycobiologie Structurale et Fonctionnelle - UMR 8576 [UGSF], Physique - IEMN (PHYSIQUE - IEMN), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Unité de Glycobiologie Structurale et Fonctionnelle (UGSF), Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Computer resources provided by the CINES and IDRIS French Supercomputing Centres, under Grants a2020/077225 and by generous extensions thereof., Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Unité de Glycobiologie Structurale et Fonctionnelle - UMR 8576 (UGSF), and Université de Lille-Centre National de la Recherche Scientifique (CNRS)

Subjects
Host cell membrane, [SDV.MHEP.ME]Life Sciences [q-bio]/Human health and pathology/Emerging diseases, [SDV.BBM.BS]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Structural Biology [q-bio.BM], Chemistry, SARS-CoV-2, Aptamer, DNA aptamers, spike protein, molecular dynamics, angiotensin converting enzyme-2, free energies, Protomer, Folding (chemistry), S1 domain, Capsid, [SDV.MHEP.MI]Life Sciences [q-bio]/Human health and pathology/Infectious diseases, [SDV.MP.VIR]Life Sciences [q-bio]/Microbiology and Parasitology/Virology, Biophysics, Molecular Biosciences, Binding site, Receptor, Original Research
Abstract

DNA aptamers are versatile molecular species obtained by the folding of short single-stranded nucleotide sequences, with highly specific recognition capabilities against proteins. Here we test the ability of selected DNA aptamers in interacting with the spike (S-)protein of the SARS-CoV-2 viral capsid. The S-protein, a trimer made up of several subdomains, develops the crucial function of recognizing the ACE2 receptors on the surface of human cells, and sub- sequent fusioning of the virus membrane with the host cell membrane. In order to do this, the S1 domain of one protomer switches between a closed conformation, in which the binding site is inaccessible to the cell receptors, and an open conformation, in which ACE2 can bind, thereby initiating the entry process of the viral genetic material in the host cell. Here we show by means of state-of-the-art molecular simulations that small DNA aptamers can recognize the S-protein of SARS-CoV-2. Moreover, their interaction with different regions of the S-protein can effectively block, or at least considerably slow down the opening process of the S1 domain, thereby largely reducing the probability of virus-cell binding. We also provide evidence that binding of the human ACE2 receptor may be drastically affected under such conditions. Given the facility and low cost of fabrication of specific aptamers, the present findings could open the way to both an innovative viral screening technique with sub-nanomolar sensitivity, and to an effective and low impact curative strategy.

Published
2021

22. Quantification of the adhesion of metal thin film interfaces by picosecond acoustics

Author

Juarez, Alejandro Vital, Devos, Arnaud, Desmarres, Jean-Michel, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique - IEMN (PHYSIQUE - IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Centre National d'Études Spatiales [Toulouse] (CNES), and Physique-IEMN (PHYSIQUE-IEMN)

Subjects
[PHYS.MECA.VIBR]Physics [physics]/Mechanics [physics]/Vibrations [physics.class-ph], Picosecond, adhesion, thin films, Acoustic, [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph]
Abstract

International audience; Thin films are widespread in numerous fields: engineering, electronics, optics, biomedical, space and many more. They are largely used and require a flawless quality. One of the most important parameters is the adhesion of a layer with the substrate. Different methods of measuring the adhesion are used with the purpose of ensuring the good quality of the material. These methods have the great disadvantage of being destructive and no repeatable [1]. Picosecond acoustics is an ultrasonic laser method suitable for thin films [2]. It works around a femtosecond laser that generates, by a thermoelastic effect, a very high frequency acoustic wave (between 10 - 300 GHz). It propagates inside the studied sample and provides informations about the elasticity and the thickness by measuring the time of flight of each echoes detected at the surface. A variation of the wavelength of the laser allows us to gain additional information. For instance, to be aware of the quality of the interface by measuring the reflection coefficient. The size of the value of this coefficient varies according to the quality of collage. A greater reflection means a poorly collage [3]. If a correlation between reflection coefficient and adhesion energy is possible, picosecond acoustics may become a non-destructive method of energy quantification. Measurements are made on nickel films deposited on various substrates using evaporation or sputtering and various parameters to influence adhesion between the film and the substrate. Adhesion of the same series of samples is then studied using two approaches: acoustic reflection using picosecond acoustics and adhesion energy as measured with the centrifuge technology [4]. In this work we present details of such a protocol and discuss the correlation between both approaches results.

Published
2020

23. Scanning Acoustic Microscopy versus Colored Picosecond Acoustics to detect interface defects in hybrid wafer bonding

Author

Bossut, Solene, Devos, Arnaud, Lhostis, S, Deloffre, E, Euvrard, C, Dettoni, F, Chaton, C, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique-IEMN (PHYSIQUE-IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information (CEA-LETI), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Physique - IEMN (PHYSIQUE - IEMN), and Laboratoire commun STMicroelectronics-IEMN T3

Subjects
Picosecond Acoustics, [PHYS.MECA.VIBR]Physics [physics]/Mechanics [physics]/Vibrations [physics.class-ph], Hybrid bonding, Scanning Acoustic Microscopy, [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph]
Abstract

International audience; Nowadays, microelectronics is making progress in miniaturization and diversification of chips by 3D integration: dies are stacked together to gain space and performances. The stacking used here is called hybrid bonding [1], as stacked surfaces are heterogeneous: part Cu and part oxide. After the bonding, it exists some defects at the interface which size can be milimetric to nanometric. Acoustic waves are very useful for detecting defects. In the field, the most used technique is the Scanning Acoustic Microscopy (SAM) which makes an image of the interface using ultrasonics (10-1000 MHz) with a XY resolution of 20 �m [2]. To detect smaller defects, Transmission Electron Microscopy (TEM) is used. Its resolution is about 0,1 nm, making this technic very local compared to SAM. Like the SAM, Colored Picosecond Acoustics (APiC) is based on acoustic waves but at higher frequencies (10-500 GHz) using of a femtosecond laser in a pump-probe scheme [3,4]. Such a technique is closer to TEM resolution. In this work, both acoustic techniques (SAM and APiC) are applied to the characterization of the same samples made of bonded wafers. APiC is first used to characterize the stack (thickness, velocity). Then, the interface contributions is focused on: Cu/Cu, Cu/oxide, oxide/oxide. As the technic makes a local measurement (typically 1-2 �m), the process is repeated at different points of the surface to get an interface image comparable to SAM result. In this work will be presented the APiC results obtained on wafers also studied by SAM to compare both approaches, especially about the resolution enhancement ApiC brings. The minimal size of the defects that APiC is able to detect will be explored.

Published
2020

24. The dark exciton ground state promotes photon-pair emission in individual perovskite nanocrystals

Author

Tamarat, Philippe, Hou, Lei, Trebbia, Jean-Baptiste, Swarnkar, Abhishek, Biadala, Louis, Louyer, Yann, Bodnarchuk, Maryna I., Kovalenko, Maksym V., Even, Jacky, Lounis, Brahim, Laboratoire Photonique, Numérique et Nanosciences (LP2N), Université de Bordeaux (UB)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS), Swiss Federal Laboratories for Materials Science and Technology [Dübendorf] (EMPA), Department of Chemistry and Applied Biosciences [ETH Zürich] (D-CHAB), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique - IEMN (PHYSIQUE - IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Laboratoire Ondes et Matière d'Aquitaine (LOMA), Université de Bordeaux (UB)-Centre National de la Recherche Scientifique (CNRS), Institut des Fonctions Optiques pour les Technologies de l'informatiON (Institut FOTON), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Centre National de la Recherche Scientifique (CNRS), Physique-IEMN (PHYSIQUE-IEMN), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), and Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)

Subjects
[PHYS]Physics [physics], Condensed Matter::Materials Science, [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph], Quantum dots, Condensed Matter::Other, Science, Physics::Optics, lcsh:Q, lcsh:Science, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Article
Abstract

Cesium lead halide perovskites exhibit outstanding optical and electronic properties for a wide range of applications in optoelectronics and for light-emitting devices. Yet, the physics of the band-edge exciton, whose recombination is at the origin of the photoluminescence, is not elucidated. Here, we unveil the exciton fine structure of individual cesium lead iodide perovskite nanocrystals and demonstrate that it is governed by the electron-hole exchange interaction and nanocrystal shape anisotropy. The lowest-energy exciton state is a long-lived dark singlet state, which promotes the creation of biexcitons at low temperatures and thus correlated photon pairs. These bright quantum emitters in the near-infrared have a photon statistics that can readily be tuned from bunching to antibunching, using magnetic or thermal coupling between dark and bright exciton sublevels., Nature Communications, 11 (1), ISSN:2041-1723

Published
2020

25. Ring charging of a single silicon dangling bond imaged by noncontact atomic force microscopy

Author

Natalia Turek, D. Deresmes, Thierry Mélin, Sylvie Godey, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Plateforme de Caractérisation Multi-Physiques - IEMN (PCMP - IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Physique-IEMN (PHYSIQUE-IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Renatech Network, PCMP PCP, Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), and Physique - IEMN (PHYSIQUE - IEMN)

Subjects
Kelvin probe force microscope, Materials science, Silicon, Resolution (electron density), Dangling bond, chemistry.chemical_element, 02 engineering and technology, 021001 nanoscience & nanotechnology, Ring (chemistry), 01 natural sciences, [SPI]Engineering Sciences [physics], chemistry, 0103 physical sciences, Microscopy, Sensitivity (control systems), Atomic physics, 010306 general physics, 0210 nano-technology, Spectroscopy, ComputingMilieux_MISCELLANEOUS
Abstract

The electrostatic properties of defects of the Si(111)-$(\sqrt{3}\ifmmode\times\else\texttimes\fi{}\sqrt{3}){R}^{\ensuremath{\circ}}30$ surface are studied using noncontact atomic force microscopy and Kelvin probe force microscopy with subnanometer resolution and subelementary charge sensitivity. We identify nonparabolicities in the frequency-voltage spectroscopy of single dangling bonds (DBs), which reveal the transition from empty to single electronically occupied DBs. Kelvin probe imaging reveals that the DB charging, however, occurs with a ring shape with radius \ensuremath{\sim}500 pm located along the circumference of the DB wave function. The ring charging is explained by a tip-induced modulation of the hole recombination rate at the DB-substrate interface.

Published
2020

26. Effect of attached resonators on magnon propagation in dipole-coupled nanostructured waveguide

Author

H. Al-Wahsh, Leonard Dobrzynski, Abdellatif Akjouj, Bahram Djafari-Rouhani, E. H. El Boudouti, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique-IEMN (PHYSIQUE-IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Benha University (BU), Physique - IEMN (PHYSIQUE - IEMN), and LPMR, Department de Physique, Faculty of science, University Mohammed I

Subjects
010302 applied physics, Physics, nanostructure, business.industry, Magnon, transmission, General Physics and Astronomy, 02 engineering and technology, filtering, 021001 nanoscience & nanotechnology, 01 natural sciences, Dipole, Resonator, [SPI]Engineering Sciences [physics], topics: magnon, 0103 physical sciences, Waveguide (acoustics), Optoelectronics, 0210 nano-technology, business
Abstract

International audience; We report a theoretical study on the effect of the exchange coupling on magnon propagation in a waveguide, composed of a dipole-coupled nanometric magnetic cluster chain and a few additional clusters near the chain. We show that an appropriate choice of the exchange coupling constant J or the geometrical/magnetic parameters of the structure can lead either to narrow dips or to narrow peaks in the transmission spectrum of magnons along the chain. The phase of the transmission amplitude, the state phase shift and the variation of the density of states are also discussed as a function of frequency for different values of J. The effect of attenuation on the transmission spectra is also discussed. The results are obtained by means of the Green's function technique. The presented study could be useful for constructing the selecting or rejecting magnon filters.

Published
2020

27. Asymmetric topological state in an elastic beam based on symmetry principle

Author

Bahram Djafari-Rouhani, Yabin Jin, Wan Wang, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique-IEMN (PHYSIQUE-IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [11902223], Shanghai Pujiang ProgramShanghai Pujiang Program [19PJ1410100], Shanghai Institutions of Higher Learning, Fundamental Research Funds for the Central UniversitiesFundamental Research Funds for the Central Universities, and Physique - IEMN (PHYSIQUE - IEMN)

Subjects
Physics, Shear waves, Elastic beam, Asymmetric transmission, Band gap, Mechanical Engineering, Phononic beam, Perturbation (astronomy), 02 engineering and technology, Flexural waves, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Topology, Mechanical system, Symmetry, [SPI]Engineering Sciences [physics], 020303 mechanical engineering & transports, 0203 mechanical engineering, Flexural strength, Mechanics of Materials, General Materials Science, 0210 nano-technology, Topological edge state, Beam (structure), Civil and Structural Engineering
Abstract

International audience; The symmetric propagation of topological edge states in two-dimensional (2D) mechanical systems cannot be directly applied to a one-dimensional (1D) system such as a beam. In this work, we adopt symmetry principle of single- and double-sided pillared phononic beams to realize asymmetric transmission of a topological edge state. The design is constituted by assembling a two-sided pillared beam (two symmetry planes) with a one-sided pillared beam (one symmetry plane). With symmetry plane consideration, we find that: 1) in a single-sided pillared beam, the torsional and the shear waves on one hand, and the longitudinal and the flexural waves on the other hand, are mixed together. 2) in a double-sided pillared beam, all the four beam's modes are decoupled from each other so that an appropriate choice of the parameters can produce for each pair (torsional-shear and longitudinal-flexural) a Dirac cone for one of the modes and a bandgap for the other mode in the same frequency range. The Dirac cone is lifted to form a trivial or nontrivial bandgap with band inversion by tuning the interval between pillars, and a topological shear/flexural edge state can be achieved consequently at the interface between two topologically different phases. Asymmetric topological edge state of the torsional/longitudinal incident wave can be achieved by assembling these two beams. It is further demonstrated a high robustness of the topological edge state against the disorder perturbation in pillar's position/frequency and the defects. The asymmetric topological state can be extended to other beam's motions following the symmetry principle and opens opportunities for designing topological solid devices with high performance, such as robust filter.

Published
2020

28. Graphene-based one-dimensional terahertz phononic crystal: band structures and surface modes

Author

Bahram Djafari-Rouhani, Ilyasse Quotane, E. H. El Boudouti, LPMR, Department de Physique, Faculty of science, University Mohammed I, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Physique - IEMN (PHYSIQUE - IEMN), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), This research received no external funding, Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique-IEMN (PHYSIQUE-IEMN), and Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)

Subjects
Materials science, resonant mode, Terahertz radiation, General Chemical Engineering, Superlattice, 02 engineering and technology, 01 natural sciences, Article, law.invention, crystal, lcsh:Chemistry, [SPI]Engineering Sciences [physics], law, 0103 physical sciences, General Materials Science, Wave vector, Surface layer, 010306 general physics, Electronic band structure, phonon, Condensed matter physics, Graphene, graphene, 021001 nanoscience & nanotechnology, lcsh:QD1-999, Free surface, Density of states, surface mode, 0210 nano-technology
Abstract

In this paper, we provide a theoretical and numerical study of the acoustic properties of infinite and semi-infinite superlattices made out of graphene-semiconductor bilayers. In addition to the band structure, we emphasize the existence and behavior of localized and resonant acoustic modes associated with the free surface of such structures. These modes are polarized in the sagittal plane, defined by the incident wavevector and the normal to the layers. The surface modes are obtained from the peaks of the density of states, either inside the bulk bands or inside the minigaps of the superlattice. In these structures, the two directions of vibrations (longitudinal and transverse) are coupled giving rise to two bulk bands associated with the two polarizations of the waves. The creation of the free surface of the superlattice induces true surface localized modes inside the terahertz acoustic forbidden gaps, but also pseudo-surface modes which appear as well-defined resonances inside the allowed bands of the superlattice. Despite the low thickness of the graphene layer, and though graphene is a gapless material, when it is inserted periodically in a semiconductor, it allows the opening of wide gaps for all values of the wave vector k// (parallel to the interfaces). Numerical illustrations of the band structures and surface modes are given for graphene-Si superlattices, and the surface layer can be either Si or graphene. These surface acoustic modes can be used to realize liquid or bio-sensors graphene-based phononic crystal operating in the THz frequency domain.

Published
2020

29. Scaling law, confined and surface modes in photonic fibonacci stub structures: theory and experiment

Author

Bahram Djafari-Rouhani, N. Ouchani, H. Aynaou, A. Mouadili, Abdellatif Akjouj, E. H. El Boudouti, École Nationale d’Ingénieurs de Monastir (ENIM), LPMR, Department de Physique, Faculty of science, University Mohammed I, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique-IEMN (PHYSIQUE-IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Université de Monastir - University of Monastir (UM), Université Hassan II [Casablanca] (UH2MC), Université Mohammed Premier [Oujda], Physique - IEMN (PHYSIQUE - IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), and This research received no external funding.

Subjects
Fibonacci number, scaling law, 02 engineering and technology, lcsh:Technology, 01 natural sciences, Electromagnetic radiation, Power law, electromagnetic modes, law.invention, lcsh:Chemistry, [SPI]Engineering Sciences [physics], law, Dispersion relation, Electric field, 0103 physical sciences, surface modes, General Materials Science, Transmission coefficient, 010306 general physics, lcsh:QH301-705.5, Instrumentation, Fluid Flow and Transfer Processes, Physics, Condensed matter physics, self-similarity, lcsh:T, Process Chemistry and Technology, General Engineering, Fibonacci structure, 021001 nanoscience & nanotechnology, lcsh:QC1-999, Computer Science Applications, Stub (electronics), [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, lcsh:Biology (General), lcsh:QD1-999, lcsh:TA1-2040, lcsh:Engineering (General). Civil engineering (General), 0210 nano-technology, Waveguide, lcsh:Physics, photonic crystal, stub
Abstract

We investigate both theoretically and experimentally the properties of electromagnetic waves propagation and localization in periodic and quasi-periodic stub structures of Fibonacci type. Each block constituting the Fibonacci sequence (FS) is composed of an horizontal segment and a vertical stub. The origin of the primary and secondary gaps shown in such systems is discussed. The behaviors and scattering properties of the electromagnetic modes are studied in two geometries, when the FS is inserted horizontally between two semi-infinite waveguides or grafted vertically along a guide. Typical properties of the Fibonacci systems such as the fragmentation of the frequency spectrum, the self-similarity following a scaling law are analyzed and discussed. It is found that certain modes inside these two geometries decrease according to a power law rather than an exponential law and the localization of these modes displays the property of self-similarity around the central gap frequency of the periodic structure where the quasi-periodicity is most effective. Also, the eigenmodes of the FS of different generation order are studied depending on the boundary conditions imposed on its extremities. It is shown that both geometries provide complementary information on the localization of the different modes inside the FS. In particular, in addition to bulk modes, some localized modes induced by both extremities of the system exhibit different behaviors depending on which surface they are localized. The theory is carried out using the Green&rsquo, s function approach through an analysis of the dispersion relation, transmission coefficient and electric field distribution through such finite structures. The theoretical findings are in good agreement with the experimental results performed by measuring in the radio-frequency range the transmission along a waveguide in which the FS is inserted horizontally or grafted vertically.

Published
2020

30. Hybridization of Love surface acoustic waves in SiO2/ST-Quartz structure with resonant pillars grafted on the meta-surface

Author

Cécile Ghouila-Houri, Yuxin Liu, Olivier Bou Matar, Abdelkrim Talbi, Philippe Pernod, Bahram Djafari-Rouhani, E. H. El Boudouti, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Laboratoire International associé sur les phénomènes Critiques et Supercritiques en électronique fonctionnelle, acoustique et fluidique (LIA LICS/LEMAC), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Acoustique Impulsionnelle & Magnéto-Acoustique Non linéaire - Fluides, Interfaces Liquides & Micro-Systèmes - IEMN (AIMAN-FILMS-IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), LPMR, Department de Physique, Faculty of science, University Mohammed I, Université Lille Nord de France (COMUE), Physique-IEMN (PHYSIQUE-IEMN), Institut d’Électronique, de Microélectronique et de Nanotechnologie - Département Opto-Acousto-Électronique - UMR 8520 (IEMN-DOAE), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-INSA Institut National des Sciences Appliquées Hauts-de-France (INSA Hauts-De-France)-Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-INSA Institut National des Sciences Appliquées Hauts-de-France (INSA Hauts-De-France), Acoustique Impulsionnelle & Magnéto-Acoustique Non linéaire - Fluides, Interfaces Liquides & Micro-Systèmes - IEMN (AIMAN-FILMS - IEMN), and Physique - IEMN (PHYSIQUE - IEMN)

Subjects
010302 applied physics, Coupling, Shear waves, Cavity modes, Materials science, business.industry, Resonance, 02 engineering and technology, Acoustic wave, 021001 nanoscience & nanotechnology, 01 natural sciences, Shear Waves, Electroacoustic, Crystal, [SPI]Engineering Sciences [physics], Resonator, Love wave, Q factor, 0103 physical sciences, Optoelectronics, Phononic Crystal, 0210 nano-technology, business, Love waves
Abstract

poster; International audience; The control of propagating waves can be achieved by introducing defect states in the phononic structure of the electroacoustic devices. This work investigates the interaction of Love waves in cavity-containing holey SiO2/Quartz structure with grafted Ni pillars. An optimal sized cavity in the holey PnC enables to obtain a cavity mode that matches the torsional resonance mode of the pillars. We showed that the cavity mode/Pillar resonance coupling depends drastically on the positions of pillars related to nodes and anti-nodes of the cavity mode. These effects are used to design a micro-electromechanical resonator presenting high quality factor without increasing the crystal size in comparison to cavity without pillars.

Published
2020

31. Numerical analysis of a tubular phononic crystal sensor

Author

Frieder Lucklum, Bernard Bonello, B. Djafari Rouhani, Michael J. Vellekoop, Yan Pennec, N. V. Mukhin, Ralf Lucklum, A. Gueddida, S. Hemon, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique - IEMN (PHYSIQUE - IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Danmarks Tekniske Universitet = Technical University of Denmark (DTU), Universität Bremen, Otto Von Guericke Univ, Acoustique pour les nanosciences (INSP-E3), Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), project 'Tubular Bell' - national French agency [ANR-18-CE920023], Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)German Research Foundation (DFG) [VE 483/2-1, LU 605/22-1], Physique-IEMN (PHYSIQUE-IEMN), and Technical University of Denmark [Lyngby] (DTU)

Subjects
010302 applied physics, Tubular, Materials science, experiment, Acoustics, Numerical analysis, 02 engineering and technology, 021001 nanoscience & nanotechnology, simulation, 01 natural sciences, Crystal, Transmission properties, [SPI]Engineering Sciences [physics], Transmission (telecommunications), 0103 physical sciences, Dispersion (optics), Displacement field, phononic crystal, Tube (fluid conveyance), dispersion, 0210 nano-technology, sensing
Abstract

International audience; We present a theoretical investigation of the dispersion and transmission properties of a tubular phononic crystal for sensing application. We show the existence of modes confined in a cavity with displacement field spreading over both the solid and fluid parts. Therefore, the frequency of the transmission peak associated to this mode should be sensitive to the sound velocity of the fluid filling the tube.

Published
2020

32. Quantized optical absorption in quasi-2D semiconductors: Theory, comparison with experiments and open questions

Author

Delerue, Christophe, Prins, P. Tim, Vanmaekelbergh, Daniel, Hens, Zeger, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique - IEMN (PHYSIQUE - IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Utrecht University [Utrecht], Universiteit Gent = Ghent University (UGENT), Physique-IEMN (PHYSIQUE-IEMN), and Universiteit Gent = Ghent University [Belgium] (UGENT)

Subjects
[PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2020

33. MoS2-graphene hybrid nanostructures enhanced localized surface plasmon resonance biosensors

Author

Mohamed El barghouti, A. Mir, Abdellatif Akjouj, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique-IEMN (PHYSIQUE-IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), and Physique - IEMN (PHYSIQUE - IEMN)

Subjects
Nanostructure, Materials science, Graphene, Bilayer, Nanoparticle, Nanotechnology, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Atomic and Molecular Physics, and Optics, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, law.invention, [SPI]Engineering Sciences [physics], law, Monolayer, Electrical and Electronic Engineering, Surface plasmon resonance, 0210 nano-technology, Absorption (electromagnetic radiation), Biosensor
Abstract

International audience; We propose a new configuration of a localized surface plasmon resonance (LSPR) biosensor that is based on MoS2-graphene hybrid structures for ultrasensitive detection of molecules. The performance parameters of the proposed biosensor are defined in terms of absorption and sensitivity. Our study show that sensitivity can be greatly increased either by adding a bilayer MoS2/graphene on the Au nanoparticles or by adding the MoS2 layer or the graphene layer on the surface of the Au nanoparticles. The absorption curves for the proposed LSPR biosensor are analyzed and compared with the conventional biosensors without MoS2/graphene. By optimizing the structure of the sensor, we find that the sensitivity as high as 360 nm/RIU can be achieved with 8-layers of MoS2 and 10-layers of graphene. In addition, we show that the sensitivity can be controlled by changing the number of the monolayer of MoS2 and/or graphene. Finally, we show that this sensor can detect successfully impure water after absorption of target single-stranded DeoxyriboNucleic Acid (ssDNA) biomolecules.

Published
2020

34. Comparison of density of states and scattering parameters in coaxial photonic crystals: theory and experiment

Author

Abdelkrim Talbi, Madiha Amrani, Bahram Djafari-Rouhani, Abdellatif Akjouj, Soufyane Khattou, A. Mouadili, E. H. El Boudouti, LPMR, Department de Physique, Faculty of science, University Mohammed I, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Acoustique Impulsionnelle & Magnéto-Acoustique Non linéaire - Fluides, Interfaces Liquides & Micro-Systèmes - IEMN (AIMAN-FILMS - IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique - IEMN (PHYSIQUE - IEMN), Acoustique Impulsionnelle & Magnéto-Acoustique Non linéaire - Fluides, Interfaces Liquides & Micro-Systèmes - IEMN (AIMAN-FILMS-IEMN), Institut d’Électronique, de Microélectronique et de Nanotechnologie - Département Opto-Acousto-Électronique - UMR 8520 (IEMN-DOAE), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-INSA Institut National des Sciences Appliquées Hauts-de-France (INSA Hauts-De-France)-Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-INSA Institut National des Sciences Appliquées Hauts-de-France (INSA Hauts-De-France), and Physique-IEMN (PHYSIQUE-IEMN)

Subjects
Physics, Scattering, Mathematical analysis, 02 engineering and technology, Dissipation, 021001 nanoscience & nanotechnology, 01 natural sciences, Matrix (mathematics), [SPI]Engineering Sciences [physics], Reflection (mathematics), 0103 physical sciences, Density of states, Scattering parameters, Boundary value problem, 010306 general physics, 0210 nano-technology, Photonic crystal
Abstract

International audience; We present an analytical and experimental study of the scattering parameters in a one dimensional (1D) symmetric photonic crystal and their relation to the density of states (DOS). The 1D photonic crystal is constituted by N alternating wires and loops that are either inserted horizontally or attached vertically between the source and load on a transmission line. The complete knowledge of the scattering matrix coefficients (Sij) allows us to access the DOS and eigenvalues of the finite periodic structure as well as the DOS and dispersion curves of an infinite periodic system. We show the usefulness of the transmission and reflection delay times and highlight their similarities and differences with respect to the DOS, in particular as a function of the absorption strength in the system. For both horizontal and vertical geometries, we show analytically that in a lossless structure, the DOS is proportional to the Friedel phase, namely the derivative of the argument of the determinant of the scattering matrix S. For a low loss system, this proportionality remains still valid with a good approximation and can be used as a practical tool to derive the DOS and therefore the dispersion curves from experimental data. Also, the absorption can be accurately extracted from the measurement of the modulus of the determinant of S. However, for increasing strength of dissipation, we show how and why these relationships cease to be valid. Still, the transmission delay time can remain an efficient tool to derive DOS even at relatively high dissipation strength. Additionally, we show that in the vertical geometry the transmission and reflection delay times exhibit negative delta peaks which are related directly to the eigenmodes of the finite system with different boundary conditions on its extremities. Our theoretical results are obtained by means of the Green's function approach, whereas the experimental demonstrations are performed using standard coaxial cables in the radio-frequency domain.

Published
2020

35. Impact of SiO2 Particles in Polyethylene Textile Membrane for Indoor Personal Heating

Author

Boutghatin, Mohamed, Assaf, Salim, Pennec, Yan, Carette, Michèle, Thomy, V., Akjouj, Abdellatif, Djafari-Rouhani, Bahram, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique-IEMN (PHYSIQUE-IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Bio-Micro-Electro-Mechanical Systems - IEMN (BIOMEMS - IEMN), European Interreg project 'Photonitex', and Physique - IEMN (PHYSIQUE - IEMN)

Subjects
polyethylene, lcsh:Chemistry, textile membrane, lcsh:QD1-999, thermal comfort, [SPI.MECA.THER]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Thermics [physics.class-ph], mid-infrared, heating, SiO2 particles, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract

International audience; Keeping the human body in a thermal comfort state inside a room has become a challenge in recent years. While the most common strategy is to heat buildings, it requires a lot of energy. Reducing this energy consumption will have positive impacts, both economically and environmentally. We propose here to act directly on the personal thermal heating of the human body, by modulating the absorption and transmission properties of a synthetic polymer membrane in the mid-infrared (MIR). We show numerically that 5% SiO2 submicron particles inserted in polyethylene (PE) and nanoporous polyethylene (nanoPE) membranes increase the radiative heating of the membrane, reducing the required ambient temperature of a room by more than 1.1 degrees C. The proposed membrane can be flexible enough to be easily integrated into conventional textiles.

Published
2020

36. p Orbital Flat Band and Dirac Cone in the Electronic Honeycomb Lattice Article

Author

Gardenier, Thomas, van den Broeke, Jette, Moes, Jesper, Swart, Ingmar, Delerue, Christophe, Slot, Marlou, Smith, C, Vanmaekelbergh, Daniel, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique-IEMN (PHYSIQUE-IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Utrecht University [Utrecht], Physique - IEMN (PHYSIQUE - IEMN), Financial support from the Foundation for Fundamental Research on Matter (FOM, grants 16PR3245 and DDC13), which is part of The Netherlands Organization for Scientific Research (NWO), as well as the European Research Council (Horizon 2020 'FIRSTSTEP', 692691), and European Project: FIRST STEP

Subjects
Condensed Matter::Quantum Gases, [PHYS]Physics [physics], [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]
Abstract

International audience; Theory anticipates that the in-plane p x , p y orbitals in a honeycomb lattice lead to potentially useful quantum electronic phases. So far, p orbital bands were only realized for cold atoms in optical lattices and for light and exciton-polaritons in photonic crystals. For electrons, in-plane p orbital physics is difficult to access since natural electronic honeycomb lattices, such as graphene and silicene, show strong s−p hybridization. Here, we report on electronic honeycomb lattices prepared on a Cu(111) surface in a scanning tunneling microscope that, by design, show (nearly) pure orbital bands, including the p orbital flat band and Dirac cone.

Published
2020

37. Generalized elastodynamic model for nanophotonics

Author

Bahram Djafari-Rouhani, Dani Torrent, Jose Alvarez, Universidad Autónoma de Madrid (UAM), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique - IEMN (PHYSIQUE - IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Institut de Noves Tecnologies de la Imatge (INIT), Universitat Jaume I, Ramon y Cajal fellowshipSpanish Government [RYC-2016-21188], Ministry of Science, Innovation and Universities [RTI2018-093921-A-C42, FIS201564886-C5-5-P, PGC2018-096955-B-C42], Universidad Autonoma de Madrid (UAM), Physique-IEMN (PHYSIQUE-IEMN), GROC, UJI, Institut de Noves Tecnologies de la Imatge, Universitat Jaume I, and UAM. Departamento de Física de la Materia Condensada

Subjects
Characteristic length, Constitutive equation, FOS: Physical sciences, Applied Physics (physics.app-ph), 02 engineering and technology, 01 natural sciences, symbols.namesake, [SPI]Engineering Sciences [physics], Polarization, 0103 physical sciences, Uniqueness, Boundary value problem, Boundary Conditions, 010306 general physics, Physics, Física, Equations of motion, Physics - Applied Physics, Dispersion, 021001 nanoscience & nanotechnology, Potential energy, Deformation, Classical mechanics, Maxwell's equations, symbols, Compressibility, 0210 nano-technology, Optics (physics.optics), Physics - Optics
Abstract

A self-consistent theory for the classical description of the interaction of light and matter at the nanoscale is presented, which takes into account spatial dispersion. Up to now, the Maxwell equations in nanostructured materials with spatial dispersion have been solved by the introduction of the so-called additional boundary conditions which, however, lack generality and uniqueness. In this paper, we derive an approach where nonlocal effects are studied in a precise and uniquely defined way, thus allowing the treatment of all solid-solid interfaces (among metals, semiconductors or insulators), as well as solid-vacuum interfaces in the same framework. The theory is based on the derivation of a potential energy for an ensemble of electrons in a given potential, where the deformation of the ensemble is treated as in a solid, including both shear and compressional deformations, instead of a fluid described only by a bulk compressibility like in the hydrodynamical approach. The derived classical equation of motion for the ensemble describes the deformation vector and the corresponding polarization vector as an elastodynamic field, including viscous forces, from which a generalized nonlocal constitutive equation for the dielectric constant is derived. The required boundary conditions are identical to that of elastodynamics and they emerge in a natural way, without any physical hypothesis outside the current description, as is commonly required in other nonlocal approaches. Interestingly, this description does not require the discontinuity of any component of the electric, magnetic, or polarization fields and, consequently, no bounded currents or charges are present at the interface, which is a more suitable description from the microscopic point of view. It is shown that the method converges to the local boundary conditions in the low spatial dispersion limit for insulators and conductors, quantified by means of a parameter defined as the characteristic length. A brief discussion about the inclusion of the spill out of electrons across surfaces is discussed. Finally, the planar interface is studied and numerical examples of the behavior of the different fields at the interfaces are presented, showing the limiting situations in which the local limit is recovered, reinforcing the self-consistency of this description.

Published
2020

38. Hybrid nanostructured plasmonic electrodes for flexible organic light-emitting diodes

Author

Yilian Li, Bruno Grandidier, Gaëtan Lévêque, Bin Wei, Pierre-Michel Adam, Renaud Bachelot, Shiwei Wu, Hong Lian, Davy Gérard, Tao Xu, School of Mechatronic Engineering and Automation, Key Laboratory of Advanced Display and System Applications, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Physique - IEMN (PHYSIQUE - IEMN), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Lumière, nanomatériaux et nanotechnologies (L2n), Institut Charles Delaunay (ICD), Université de Technologie de Troyes (UTT)-Centre National de la Recherche Scientifique (CNRS)-Université de Technologie de Troyes (UTT)-Centre National de la Recherche Scientifique (CNRS), This work was financially supported by the National Natural Science Foundation of China (61775130, 11974236), Natural Science Foundation of Shanghai (19ZR1419500) and Science and Technology Commission of Shanghai Municipality Program (19DZ2281000)., Institut d’Électronique, de Microélectronique et de Nanotechnologie - IEMN (Univ. Lille, CNRS, Ecole Centrale Lille, Yncréa-ISEN, UVHC) (IEMN - UMR 8520), Ecole Centrale de Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique-IEMN (PHYSIQUE-IEMN), Ecole Centrale de Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Ecole Centrale de Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), and Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA)

Subjects
Photoluminescence, Materials science, surface plasmon, Bioengineering, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, 7. Clean energy, Silver nanoparticle, law.invention, [SPI]Engineering Sciences [physics], law, exfoliated graphene, OLED, General Materials Science, flexible organic light-emitting diodes, Electrical and Electronic Engineering, Plasmon, Diode, [PHYS]Physics [physics], business.industry, Graphene, Mechanical Engineering, Surface plasmon, General Chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, nanowire-nanoparticle junction, Mechanics of Materials, Electrode, flexible transparent electrode, Optoelectronics, 0210 nano-technology, business
Abstract

International audience; Improved performance in flexible organic light-emitting diodes (OLEDs) is demonstrated by using a hybrid nanostructured plasmonic electrode consisting of silver nanowires (AgNWs) decorated with silver nanoparticles (AgNPs) and covered by exfoliated graphene sheets. Such all-solution processed electrodes show high optical transparency and electrical conductivity. When integrated in an OLED with super yellow polyphenylene vinylene as the emissive layer, the plasmon coupling of the NW-NP hybrid plasmonic system is found to significantly enhance the fluorescence, demonstrated by both simulations and photoluminescence measurements, leading to a current efficiency of 11.61 cd A−1 and a maximum luminance of 20 008 cd m−2 in OLEDs. Stress studies reveal a superior mechanical flexibility to the commercial indium-tin-oxide (ITO) counterparts, due to the incorporation of exfoliated graphene sheets. Our results show that these hybrid nanostructured plasmonic electrodes can be applied as an effective alternative to ITO for use in high-performance flexible OLEDs.

Published
2020

39. Properties of Nanocrystalline Silicon Probed by Optomechanics

Author

Jeremie Maire, Guillermo Arregui, Emigdio Chavez-Angel, Kestutis Grigoras, Jouni Ahopelto, Amadeu Griol, Arnaud Devos, Clivia M. Sotomayor-Torres, Martin F. Colombano, Nestor E. Capuj, Tapani Makkonen, Alejandro Martínez, Jaakko Saarilahti, Teija Hakkinen, Laurent Bellieres, Daniel Navarro-Urrios, European Commission, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Ministerio de Economía y Competitividad (España), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique-IEMN (PHYSIQUE-IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), he following support is gratefullyacknowledged: the European Commission projectPHENOMEN (H2020-EU-FET Open GA no. 713450), theSpanish Severo Ochoa Excellence program (SEV-2017-0706), CMST and ECA: the Spanish MICINN project SIP(PGC2018-101743-B-I00), DNU and AM: the Spanish MICINN project PGC2018-094490-B-C22. DNU holds aRamón y Cajal postdoctoral fellowship (RYC-2014-15392), MFC and GA hold a S. Ochoa and a M. S. Curie COFUNDBIST postgraduate studentship, respectively., European Project: 713450,H2020,H2020-FETOPEN-2014-2015-RIA,PHENOMEN(2016), and Physique - IEMN (PHYSIQUE - IEMN)

Subjects
Silicon, QC1-999, FOS: Physical sciences, Physics::Optics, 02 engineering and technology, Applied Physics (physics.app-ph), Cavity optomechanics, 01 natural sciences, Annealing, Silici, [SPI]Engineering Sciences [physics], Condensed Matter::Materials Science, 0103 physical sciences, Curie, European commission, Electrical and Electronic Engineering, 010306 general physics, Optomechanics, Ones electromagnètiques, Condensed Matter - Materials Science, nanocrystalline silicon, Electromagnetic waves, Physics, Nanocrystalline silicon, Materials Science (cond-mat.mtrl-sci), Physics - Applied Physics, cavity optomechanics, 021001 nanoscience & nanotechnology, Engineering physics, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], annealing, 0210 nano-technology, Physics - Optics, Biotechnology, Optics (physics.optics)
Abstract

Nanocrystalline materials exhibit properties that can differ substantially from those of their single crystal counterparts. As such, they provide ways to enhance and optimize their functionality for devices and applications. Here, we report on the optical, mechanical and thermal properties of nanocrystalline silicon probed by means of optomechanical nanobeams to extract information of the dynamics of optical absorption, mechanical losses, heat generation and dissipation. The optomechanical nanobeams are fabricated using nanocrystalline films prepared by annealing amorphous silicon layers at different temperatures. The resulting crystallite sizes and the stress in the films can be controlled by the annealing temperature and time and, consequently, the properties of the films can be tuned relatively freely, as demonstrated here by means of electron microscopy and Raman scattering. We show that the nanocrystallite size and the volume fraction of the grain boundaries play a key role in the dissipation rates through nonlinear optical and thermal processes. Promising optical (13,000) and mechanical (1700) quality factors were found in the optomechanical cavity realized in the nanocrystalline Si resulting from annealing at 950°C. The enhanced absorption and recombination rates via the intragap states and the reduced thermal conductivity boost the potential to exploit these nonlinear effects in applications including Nanoelectromechanical systems (NEMS), phonon lasing and chaos-based devices., The following support is gratefully acknowledged: the European Commission project PHENOMEN (H2020-EU-FET Open GA no. 713450), the Spanish Severo Ochoa Excellence program (SEV-2017-0706), CMST and ECA: the Spanish MICINN project SIP (PGC2018-101743-B-I00), DNU and AM: the Spanish MICINN project PGC2018-094490-B-C22. DNU holds a Ramón y Cajal postdoctoral fellowship (RYC-2014-15392); MFC and GA hold a S. Ochoa and a M. S. Curie COFUND BIST postgraduate studentship, respectively.

Published
2020
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40. Rate-dependent force–extension models for single-molecule force spectroscopy experiments

Author

Stefano Giordano, Fabio Manca, Pier Luca Palla, Manon Benedito, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Adhésion et Inflammation (LAI), Assistance Publique - Hôpitaux de Marseille (APHM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Centre Interdisciplinaire de Nanoscience de Marseille (CINaM), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU), Physique-IEMN (PHYSIQUE-IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Acoustique Impulsionnelle & Magnéto-Acoustique Non linéaire - Fluides, Interfaces Liquides & Micro-Systèmes - IEMN (AIMAN-FILMS-IEMN), Institut d’Électronique, de Microélectronique et de Nanotechnologie - Département Opto-Acousto-Électronique - UMR 8520 (IEMN-DOAE), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-INSA Institut National des Sciences Appliquées Hauts-de-France (INSA Hauts-De-France)-Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-INSA Institut National des Sciences Appliquées Hauts-de-France (INSA Hauts-De-France), Aix Marseille Université (AMU)-Assistance Publique - Hôpitaux de Marseille (APHM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Physique - IEMN (PHYSIQUE - IEMN), and Acoustique Impulsionnelle & Magnéto-Acoustique Non linéaire - Fluides, Interfaces Liquides & Micro-Systèmes - IEMN (AIMAN-FILMS - IEMN)

Subjects
Protein Folding, Bistability, Filamins, [SDV]Life Sciences [q-bio], Protein domain, Biophysics, Microscopy, Atomic Force, 03 medical and health sciences, 0302 clinical medicine, Structural Biology, Molecule, Connectin, Statistical physics, [NLIN]Nonlinear Sciences [physics], Elasticity (economics), single molecule force spectroscopy, Molecular Biology, 030304 developmental biology, Mechanical Phenomena, Physics, [PHYS]Physics [physics], 0303 health sciences, Quantitative Biology::Biomolecules, biology, Force spectroscopy, Cell Biology, Statistical mechanics, Single Molecule Imaging, Folding (chemistry), Models, Chemical, biology.protein, Titin, spin variables approach, rate-dependent theory, chain of bistable units, 030217 neurology & neurosurgery
Abstract

International audience; Single-molecule force spectroscopy (SMFS) techniques allow for the measurements of several static and dynamic features of macromolecules of biological origin. In particular, the atomic force microscopy (AFM), used with a variable pulling rate, provides valuable information on the folding/unfolding dynamics of proteins. We propose here two different models able to describe the out-of-equilibrium statistical mechanics of a chain composed of bistable units. These latter represent the protein domains, which can be either folded or unfolded. Both models are based on the Langevin approach and their implementation allows for investigating the effect of the pulling rate and of the device intrinsic elasticity on the chain unfolding response. The theoretical results (both analytical and numerical) have been compared with experimental data concerning the unfolding of the titin and filamin proteins, eventually obtaining a good agreement over a large range of the pulling rates.

Published
2020

41. Coupling of integrated waveguide and optomechanic cavity for microwave phonon excitation in Si nanobeams

Author

Yan Pennec, Alexander V. Korovin, Andrea Di Donato, Davide Mencarelli, A. Gueddida, Bahram Djafari-Rouhani, Luca Pierantoni, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Physique - IEMN (PHYSIQUE - IEMN), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), European Project entitled 'All-Phononic circuits Enabled by Opto-mechanics' (PHENOMEN), H2020 FETOPEN 2014-2015-RIA [713450], European Project: 713450,H2020,H2020-FETOPEN-2014-2015-RIA,PHENOMEN(2016), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique-IEMN (PHYSIQUE-IEMN), and Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)

Subjects
lcsh:Applied optics. Photonics, Materials science, Phonon, Physics::Optics, 02 engineering and technology, 01 natural sciences, 7. Clean energy, photonic cavity, Light scattering, law.invention, [SPI]Engineering Sciences [physics], Quality (physics), law, 0103 physical sciences, Radiology, Nuclear Medicine and imaging, 010306 general physics, Instrumentation, Electronic circuit, Coupling, business.industry, lcsh:TA1501-1820, opto mechanical interaction, 021001 nanoscience & nanotechnology, phononic cavity, Atomic and Molecular Physics, and Optics, Optoelectronics, 0210 nano-technology, business, Waveguide, Excitation, Microwave
Abstract

International audience; The availability of high quality manufacturing for optical micro/nano patterned cavities paves the way to the development of scalable circuits and devices based on optomechanical (OM) interaction of sound and light in extremely small volumes. In this contribution, we propose a new study on OM cavities that can lead to precise control of their coupling with closely integrated waveguides, a necessary condition to enhance mode excitation and wave energy trapping, opening the possibility for many potential applications in wave guiding, filtering, confinement, and sensing. Moreover, in this way the need for bulky experimental setups and/or optical fiber coupling/excitation is avoided. At the same time, quality factors of mechanical and optical modes resonating in the cavity are optimized, together with their OM coupling coefficients: high confinement of both excitations is a prerequisite to enable their acousto-optic (AO) interaction. To this aim, the transversal size of the cavity has been parabolically tapered, with the additional benefit of separating the cavity and the integrated waveguide far from the coupling region. The finite-element method has been used to perform full-wave analysis, and an accurate discussion about the simulation setup needed to properly describe optical scattering and radiation has been provided.

Published
2020

42. Coupling of ToF-SIMS and AFM for the identification of the chemical species involved in the nucleation process of soot particles in flame combustion

Author

Elias, Jessy, Mercier, Xavier, Faccinetto, Alessandro, Nuns, Nicolas, Godey, Sylvie, Deresmes, Dominique, Melin, Thierry, Physicochimie des Processus de Combustion et de l’Atmosphère - UMR 8522 (PC2A), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique-IEMN (PHYSIQUE-IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), PCMP PCP, Renatech Network, Plateforme de Caractérisation Multi-Physiques - IEMN (PCMP - IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), and Physique - IEMN (PHYSIQUE - IEMN)

Subjects
[SPI]Engineering Sciences [physics], [CHIM]Chemical Sciences
Abstract

International audience; Soot formation in combustion is a major research problem because of the negative impact of the carbonaceous particles in the exhausts on human health and the environment. However, state of the art knowledge on the chemical species and reaction pathways leading to the formation of soot particles is not yet complete. In particular, many questions are still open on the transformation of gaseous molecular precursors into condensed phase soot particles (soot nucleation). One of the hypotheses proposed in the literature, the nucleation driven by the dimerization of small polycyclic aromatic hydrocarbons (PAHs), has been recently used in models to successfully reproduce the soot volume fraction profiles measured in laboratory flames. However, experimental evidences on the existence of dimers in the flame environment are still lacking. In this work, Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) and high-resolution Atomic Force Microscopy (AFM) are coupled with the aim of characterizing the chemistry of the building blocks involved in the formation of nascent soot particles.

Published
2020

43. Thermal resistance of an interfacial molecular layer by first-principles molecular dynamics

Author

Evelyne Martin, Guido Ori, Thuy-Quynh Duong, Carlo Massobrio, Mauro Boero, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique-IEMN (PHYSIQUE-IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique - IEMN (PHYSIQUE - IEMN), G.O. acknowledges the Seed Money program of Eucor-The European Campus (project MEDIA) for financial support. This work was funded by the French ANR via the Project No. ANR-17-CE09-0039-02 'SIRENA.' Calculations were performed by using resources from GENCI (Grand Equipement National de Calcul Intensif) (Grant Nos. x2016095071, A0030910296, A0040905071, and A0050910296), Pôle HPC Equip@Meso of the University of Strasbourg, and clustphy2 at the IEMN.REFERENCES, GENCI, and ANR-17-CE09-0039,SIRENA,Simulation des résistances thermiques d'interface: utilisation des transitoires de chaleur pour des simulations en dynamique moléculaire ab initio(2017)

Subjects
Thermal equilibrium, Materials science, 010304 chemical physics, Silicon, Thermal resistance, General Physics and Astronomy, chemistry.chemical_element, Thermal transfer, 010402 general chemistry, Thermal conduction, 01 natural sciences, 0104 chemical sciences, Molecular dynamics, Thermal conductivity, chemistry, Chemical physics, Phase (matter), 0103 physical sciences, Physical and Theoretical Chemistry, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]
Abstract

International audience; The approach-to-equilibrium molecular dynamics (AEMD) methodology is applied in combination with first-principles molecular dynamics (FPMD) to investigate the thermal transfer between two silicon blocks connected by a molecular layer. Our configuration consists of alkanes molecules strongly coupled to the silicon surfaces via covalent bonds. In the phase 1 of AEMD, the two Si blocks are thermalized at high and low temperatures to form the hot and cold reservoirs. During the phase 2 of AEMD, a transfer between reservoirs occurs until thermal equilibrium is reached. The transfer across the interface dominates the transient over heat conduction within the reservoirs. The value of the thermal interface conductance is in agreement with experimental data obtained for analogous bonding cases between molecules and reservoirs. The dependence on length of the thermal interface resistance features two contributions. One is constant (the resistance at the silicon/molecule interface) while the other varies linearly with the length of the molecular chains (diffusive transport). The corresponding value of the thermal conductivity agrees well with experiments.

Published
2020

44. Broadband Asymmetric Propagation in Pillared Meta-Plates

Author

Wei Wang, Daniel Torrent, Guohua Nie, Bahram Djafari-Rouhani, Yabin Jin, Lin Chen, School of Aerospace Engineering and Applied Mechanics, Tongji University, Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), GROC, UJI, Institut de Noves Tecnologies de la Imatge, Universitat Jaume I, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique-IEMN (PHYSIQUE-IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Institut de Noves Tecnologies de la Imatge (INIT), Universitat Jaume I, and Physique - IEMN (PHYSIQUE - IEMN)

Subjects
General Chemical Engineering, Acoustics, 02 engineering and technology, 01 natural sciences, Inorganic Chemistry, Lamb waves, Lamb wave, 0103 physical sciences, Broadband, Acoustic metamaterials, Range (statistics), lcsh:QD901-999, General Materials Science, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, 010306 general physics, phononic crystals, Mechanical energy, Physics, [PHYS]Physics [physics], Tandem, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Transmission (telecommunications), lcsh:Crystallography, 0210 nano-technology, asymmetric transmission
Abstract

International audience; The asymmetric propagation of mechanical energy across interfaces is a challenging problem with a wide range of applications. In this work, we present a novel structure presenting the asymmetric propagation of elastic waves in thin plates in a broadband range. The structure consists of a combination of symmetrically and asymmetrically distributed pillars, so that the former decouple the different Lamb modes and the latter mix all of them. We show that a combination in tandem with these two structures can realize an efficient broadband asymmetric propagation at the subwavelength range and achieve a transmission difference larger than 200 dB between forward and backward directions. The proposed pillared meta-plate brings a new way for subwavelength and broadband wave manipulation in the fields of wave isolation, sensing and communication, among others.

Published
2020

45. Numerical Modeling of Acousto–Plasmonic Coupling in Metallic Nanoparticles

Author

Abdellatif Akjouj, Ophélie Saison-Francioso, Gaëtan Lévêque, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique-IEMN (PHYSIQUE-IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), and Physique - IEMN (PHYSIQUE - IEMN)

Subjects
Materials science, business.industry, Finite element software, Multiphysics, Physics::Medical Physics, Astrophysics::Instrumentation and Methods for Astrophysics, Numerical modeling, Physics::Optics, 02 engineering and technology, Plasmonic coupling, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Coupling (electronics), [PHYS.PHYS.PHYS-COMP-PH]Physics [physics]/Physics [physics]/Computational Physics [physics.comp-ph], General Energy, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Optoelectronics, Physical and Theoretical Chemistry, 0210 nano-technology, business, Metal nanoparticles
Abstract

International audience; We describe a computational approach to study the acousto-plasmonic coupling in metallic nanoparticles. We use the high level multiphysics finite element software FreeFEM developed at Laboratoire Jacques-Louis Lions of Pierre and Marie Curie University (Paris). Our numerical method determines one after the other the acoustic modes of the nanoparticles and the modulation of the electromagnetic properties. The transfer of the deformed geometries between acoustic and electromagnetic simulations is realized by an update of the nodal coordinates situated at the boundary between the nanoparticle and its host medium, and using a mesh deformation algorithm based on radial basis function interpolation. Thus we theoretically investigate different coupling mechanisms between confined vibrations and surface plasmons: shape effect, electron density effect due to changes of the nanoparticle volume and inter-band transitions effect which is evaluated by the deformation potential mechanism.

Published
2020

46. Magnetic demultiplexer circuit with four channels

Author

A. Mouadili, Abdellatif Akjouj, Leonard Dobrzynski, E. H. El Boudouti, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique-IEMN (PHYSIQUE-IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), and Physique - IEMN (PHYSIQUE - IEMN)

Subjects
Physics, [SPI]Engineering Sciences [physics], Demultiplexer, Solid-state physics, Magnon, 0103 physical sciences, Total transmission, General Physics and Astronomy, Perturbation (astronomy), 010306 general physics, Topology, 01 natural sciences
Abstract

International audience; We present a magnetic demultiplexer that allows us to transfer a magnon from one guide to another without perturbation the other guides. The proposed devise is formed by introducing a resonant system between two infinite guides. The resonant system has the role of coupling the guides to allow the magnons to pass from one guide to another for a well-defined frequency. The filtered frequency depends on the lengths of the different elements that constitute the system. In the analytical calculations we demonstrate how to choose the geometrical parameters to get total transmission.

Published
2020

47. A tale of Tartaglia’s Libro Sesto & La Gionta in Quesiti et Inventioni Diverse (1546-1554): exploring the historical and cultural foundations

Author

Raffaele Pisano, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique-IEMN (PHYSIQUE-IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), and Physique - IEMN (PHYSIQUE - IEMN)

Subjects
Philosophy of science, Multidisciplinary, 05 social sciences, Military architecture, 050301 education, 01 natural sciences, Intellectual history, [SPI]Engineering Sciences [physics], History and Philosophy of Science, 0103 physical sciences, 010306 general physics, 0503 education, Humanities, ComputingMilieux_MISCELLANEOUS
Abstract

Forums, I extensively analysed Tartaglia’s corpus: science of weights, geometry, arithmetic, mathematics and physics–trajectories of the projectiles, fortifications, included its intelligibility science in the military architecture. The latter is exposed in Book VI of the Quesiti et invention diverse (hereafter Quesiti). In Quesiti there is La Gionta del sesto libro—a kind of appendix to the Book VI containing drawings of the geometric shape of the Italian fortifications. It is based on Euclidean geometry and other figures where a scale is displayed. The interest—included intellectual history and cultural foundations of science—is: what is the role–played by La Gionta del sesto libro in the Quesiti? Is it independent booklet/speeches? If yes, when Tartaglia did write it? In this paper, I present an historical–philological–foundational hypothesis on the Tartaglia’s fortifications corpus, as exposed in the Book VI and La Gionta del sesto libro; with respect to dates of editions of Quesiti (1546, 1554). This goal is important to make historically clear both the editorial role–played by Curzio Troiano Navo (fl. 16th) in the Tartaglia’s corpus before—after Tartaglia’s death (1557) and the particular interest and development of subject of fortifications by Tartaglia between 1537–1546 and 1554.

Published
2020

48. Plasmon-enhanced electrocatalytic oxygen reduction in alkaline media on gold nanohole electrodes

Author

Anderson G. M. da Silva, Robert Wojcieszak, Bahram Djafari-Rouhani, Sorin Melinte, Palaniappan Subramanian, Dalila Meziane, Noual Adnane, Franck Dumeignil, Sabine Szunerits, Liuqing Pang, Georgiana Sandu, Sébastien Paul, Vladyslav Mishyn, Rabah Boukherroub, Tamazouzt Nait Saada, Université de Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN], Université Mouloud Mammeri [Tizi Ouzou] [UMMTO], Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS], Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Laboratoire de Chimie appliquée & génie chimique [Tizi-Ouzou] (LCAGC), Université Mouloud Mammeri [Tizi Ouzou] (UMMTO), Institute of Chemistry [University of São Paulo] | Instituto de Química [Universidade de São Paulo], Universidade de São Paulo = University of São Paulo (USP), Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), Université Mohammed Premier [Oujda], Physique - IEMN (PHYSIQUE - IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Université Catholique de Louvain = Catholic University of Louvain (UCL), Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), NanoBioInterfaces - IEMN (NBI - IEMN), Institut d’Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520 (IEMN), Ecole Centrale de Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Laboratoire International associé sur les phénomènes Critiques et Supercritiques en électronique fonctionnelle, acoustique et fluidique (LIA LICS/LEMAC), Ecole Centrale de Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Ecole Centrale de Lille-Université de Lille-Université Polytechnique Hauts-de-France (UPHF)-Université Polytechnique Hauts-de-France (UPHF), UCL - SST/ICTM/ELEN - Pôle en ingénierie électrique, University of São Paulo (USP), Physique-IEMN (PHYSIQUE-IEMN), Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille, and Institute of Chemistry, University of São Paulo

Subjects
Materials science, chemistry.chemical_element, 02 engineering and technology, 010402 general chemistry, Electrochemistry, 01 natural sciences, 7. Clean energy, Catalysis, [CHIM]Chemical Sciences, General Materials Science, Irradiation, Plasmon, ComputingMilieux_MISCELLANEOUS, Power density, Renewable Energy, Sustainability and the Environment, General Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, [CHIM.CATA]Chemical Sciences/Catalysis, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Wavelength, chemistry, Chemical engineering, Electrode, 0210 nano-technology, Platinum
Abstract

Plasmon-driven chemical transformation has become a promising approach for enhancing sluggish electrocatalytic reactions. Herein, an alternative enhancement strategy employing plasmon-induced hot electrons was developed and found to be competitive with oxygen reduction reaction (ORR) on platinum electrodes. We demonstrated that, by using the intertwined plasmon-catalytic-electrochemical properties of nanoperforated gold thin film electrodes, the ORR under alkaline conditions could be significantly enhanced by careful tuning of the laser wavelength and power density. Irradiation at 980 nm and 2 W cm−2 displays maximal current densities of j = −6.0 A cm−2 at 0.95 V vs. RHE, under hydrodynamic conditions, comparable to that of commercial Pt/C (40 wt%) catalysts, with good long-term stability. The wavelength-dependent electrochemical reduction confirmed that the hot carriers formed during plasmon decay are responsible for the improved electrocatalytic performance. 8;20

Published
2020

49. Heat transport in disordered network forming materials: Size effects and existence of propagative modes

Author

Mauro Boero, Carlo Massobrio, Guido Ori, Evelyne Martin, Thuy-Quynh Duong, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique-IEMN (PHYSIQUE-IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Physique - IEMN (PHYSIQUE - IEMN), Grand Équipement National De Calcul Intensif, Agence Nationale de la Recherche, and ANR-17-CE09-0039,SIRENA,Simulation des résistances thermiques d'interface: utilisation des transitoires de chaleur pour des simulations en dynamique moléculaire ab initio(2017)

Subjects
Materials science, General Computer Science, General Physics and Astronomy, 02 engineering and technology, 010402 general chemistry, Condensed Matter::Disordered Systems and Neural Networks, 01 natural sciences, Atomic units, Condensed Matter::Materials Science, Thermal conductivity, General Materials Science, Crystalline silicon, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Nanoscopic scale, Nanoscale effects, [PHYS]Physics [physics], General Chemistry, 021001 nanoscience & nanotechnology, Nanocrystalline material, 0104 chemical sciences, Amorphous solid, Condensed Matter::Soft Condensed Matter, Computational Mathematics, Mechanics of Materials, Chemical physics, Disordered materials, 0210 nano-technology
Abstract

International audience; We show that in nanoscale disordered networks the thermal conductivity reduces with respect to the bulk value in a way remindful of the analogous behavior in nanocrystalline systems. Our rationale is based on the analogy with nanostruc-tured crystalline silicon and is substantiated by results obtained (experimen-tally, analytically and by atomic scale modelling) on crystalline Si, amorphous Si, glassy SiO 2 and glassy GeTe 4. We point out the implication of such findings on the potential performances of nanoscale heat devices. Thermal transport by conduction in non-metallic materials is due to heat carriers that either propagate with a wave vector (propagons) or that are extended but have no wave vector (diffusons) [1]. Propagons are sensitive to size reduction, diffusons are not. In crystals, the role of propagons is played by phonons travelling undisturbed without undergoing collisions (i.e. ballistically) 5 on a mean free path (MFP) until they experience a scattering (diffusive) event. In a bulk crystalline system, diffusive events are unavoidable regardless of the extent of the largest MFP. This picture changes drastically when a material has nanoscale dimensions, as in a film or a wire for example, these changes being

Published
2020

50. Three dimensional resistance mapping of self-organized Sr3V2O8 nanorods on metallic perovskite SrVO3 matrix

Author

Matthieu Euchin, Louis Biadala, Mathieu Frégnaux, Vincent Notot, Rosine Coq Germanicus, Damien Aureau, Alexis Boileau, Bruno Berini, Ulrike Lüders, Bruno Grandidier, Valérie Demange, Arnaud Fouchet, Yves Dumont, Maxime Berthe, Andréia Márcia Santos de Souza David, Wilfrid Prellier, Yoan Bourlier, Laboratoire de cristallographie et sciences des matériaux (CRISMAT), École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC), Institut Lavoisier de Versailles (ILV), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Groupe d'Etude de la Matière Condensée (GEMAC), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Synthèse Caractérisation Analyse de la Matière (ScanMAT), Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut de Chimie du CNRS (INC), Physique-IEMN (PHYSIQUE-IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), French Agence Nationale de la Recherche (ANR)French National Research Agency (ANR) [ANR-17-CE08-0012], Reseaux d'Interets Normands RIN PLACENANO, EQUIPEX program Excelsior [ANR-11-EQPX-0015], H2020 program [PITN-GA-2016-722176], RENATECH network from IDEX Paris-Saclay [ANR-11-LABEX-0039], Labex CHARMMMAT from IDEX Paris-Saclay [ANR-11-LABEX-0039], Region BretagneRegion Bretagne, Rennes MetropoleRegion Bretagne, Departement d'Ille et Vilaine, European UnionEuropean Union (EU) [39126, 37339], Renatech Network, PCMP PCP, ANR-17-CE08-0012,Polynash,Substrats bas couts polycristallins et Nanofeuillets de germination(2017), ANR-11-EQPX-0015,Excelsior,Centre expérimental pour l'étude des propriétés des nanodispositifs dans un large spectre du DC au moyen Infra-rouge.(2011), ANR-11-LABX-0039,CHARMMMAT,CHimie des ARchitectures MoléculairesMultifonctionnelles et des MATériaux(2011), European Project: 722176,H2020, H2020-MSCA-ITN-2016,INDEED(2017), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Physique - IEMN (PHYSIQUE - IEMN)

Subjects
Materials science, EELS, Spreading resistance profiling, Annealing (metallurgy), STM, General Physics and Astronomy, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, law.invention, law, 3D-SSRM, Microscopy, Functional perovskite oxide, [CHIM]Chemical Sciences, Thin film, business.industry, Electron energy loss spectroscopy, Surfaces and Interfaces, General Chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 0104 chemical sciences, Surfaces, Coatings and Films, Electron diffraction, Optoelectronics, Vanadate, Nanorod, Nanorods, Scanning tunneling microscope, AFM, 0210 nano-technology, business
Abstract

International audience; Self-organized epitaxial nanorods, obtained by an adapted annealing process after deposition of metallic strontium vanadate perovskite (SrVO3) thin films, are analyzed to determine their structural, chemical and electrical properties. After the identification of the Sr3V2O8 phase of the nanorods by electron diffraction; Electron Energy Loss Spectroscopy investigations show the vanadium oxidation state (V5+ ) for the nanorods. Two scanning probe techniques are deployed to determine the specific local electrical properties of these Sr3V2O8 nanorods. In ambient conditions, local electrical properties are studied by Scanning Spreading Resistance Microscopy based on an Atomic Force Microscope and multiple probe scanning tunneling microscopy is used for the study in ultrahigh vacuum. Both techniques reveal that local electrical resistances of the nanorods are five order of magnitude higher than the resistance of the perovskite SrVO3 matrix. Futhermore, the nanorods are found to be etched by repeating scanning of the conducive Atomic Force Microcopy probe, enabling a three-dimensional depth profile of the nanorods resistance with 3D-Spreading Resistance Microscopy mode. A partial embedding of the nanorods in the underlying SrVO3 film is proved and the impact of the water meniscus at the origin of the selective etching observed during Scanning Spreading Resistance Microscopy, in ambient conditions, is discussed.

Published
2020

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