194 results on '"Yury P. Rakovich"'
Search Results
2. Linear and nonlinear optics of hybrid plexitonic nanosystems.
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Dzmitry Melnikau, Ruben Esteban, Alexander A. Govyadinov, Diana Savateeva, Thomas Simon, Ana Sanchez-Iglesias, Marek Grzelczak, Mikolaj K. Schmidt, Alexander S. Urban, Luis M. Liz-Marzan, Jochen Feldmann, Javier Aizpurua, and Yury P. Rakovich
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- 2017
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3. Strong excitonic-plasmonic coupling in hybrid system of metal nanoparticles and J-aggregates of organic dye.
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Dzmitry Melnikau, Diana Savateeva, Ana Sanchez-Iglesias, Marek Grzelczak, Luis M. Liz-Marzan, Mikolaj K. Schmidt, Ruben Esteban, Javier Aizpurua, and Yury P. Rakovich
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- 2015
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4. Anti-stokes emission in whispering gallery mode microcavities with semiconductor quantum dots.
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Diana Savateeva, John F. Donegan, and Yury P. Rakovich
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- 2015
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5. Coupling effect in hybrid system of plasmonic nanoparticles and J-aggregates yields double Rabi splitting.
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Dzmitry Melnikau, Diana Savateeva, and Yury P. Rakovich
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- 2014
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6. Enhanced chiroptical properties of a hybrid material consisting of J-aggregates and silver nanoparticles.
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Dzmitry Melnikau, Diana Savateeva, Y. K. Gun'ko, and Yury P. Rakovich
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- 2014
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7. Optical properties of hollow polymer microspheres loaded with semiconductor quantum dots.
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Diana Savateeva, Dzmitry Melnikau, J. E. McCarthy, F. Purcell-Milton, V. Gerard, David McCloskey, John F. Donegan, Y. K. Gun'ko, S. Chugunov, K. I. Rusakov, and Yury P. Rakovich
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- 2014
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8. Statistical analysis of photoluminescence decay kinetics in quantum dot ensembles: Effects of inorganic shell composition and environment
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João R. Martins, Victor Krivenkov, César R. Bernardo, Pavel Samokhvalov, Igor Nabiev, Yury P. Rakovich, Mikhail I. Vasilevskiy, Fundação para a Ciência e a Tecnologia (Portugal), European Commission, Eusko Jaurlaritza, Universidad del País Vasco, Russian Science Foundation, and European Research Council
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energy transfer ,General Energy ,luminescence decays ,underlying distributions ,mathematical functions ,dynamics behavior ,Physical and Theoretical Chemistry ,recombination ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials - Abstract
Discerning the kinetics of photoluminescence (PL) decay of packed quantum dots (QDs) and QD-based hybrid materials is of crucial importance for achieving their promising potential. However, the interpretation of the decay kinetics of QD-based systems, which usually are not single-exponential, remains challenging. Here, we present a method for analyzing photoluminescence (PL) decay curves of fluorophores by studying their statistical moments. A certain combination of such moments, named as the n-th order moments’ ratio, Rn, is studied for several theoretical decay curves and experimental PL kinetics of CdSe quantum dots (QDs) acquired by time-correlated single photon counting (TCSPC). For the latter, three different case studies using the Rn ratio analysis are presented, namely, (i) the effect of the inorganic shell composition and thickness of the core–shell QDs, (ii) QD systems with Förster resonance energy transfer (FRET) decay channels, and (iii) system of QDs near a layer of plasmonic nanoparticles. The proposed method is shown to be efficient for the detection of slight changes in the PL kinetics, being time-efficient and requiring low computing power for performing the analysis. It can also be a powerful tool to identify the most appropriate physically meaningful theoretical decay function, which best describes the systems under study., Funding from the Portuguese Foundation for Science and Technology (FCT) in the framework of the Strategic Financing UID/FIS/04650/2020 is acknowledged. V.K. acknowledges funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement 101025664 (QESPEM). Y.P.R. acknowledges funding from the Basque Government for Consolidated groups of the Basque University (Grant IT 1526-22) and Basic and/or Applied Research Projects (Grant PIBA-2021-0026). Part of this work dealing with the synthesis of CdSe/ZnS and CdSe/ZnS/CdS/ZnS quantum dots was supported by the Russian Science Foundation (Grant 18-19-00588).
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- 2022
9. Metal-polymer heterojunction in colloidal-phase plasmonic catalysis
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Andrea Rogolino, Nathalie Claes, Judit Cizaurre, Aimar Marauri, Alba Jumbo-Nogales, Zuzanna Lawera, Joscha Kruse, María Sanromán-Iglesias, Ibai Zarketa, Unai Calvo, Elisa Jimenez-Izal, Yury P. Rakovich, Sara Bals, Jon M. Matxain, Marek Grzelczak, European Commission, Ministerio de Ciencia, Innovación y Universidades (España), European Research Council, Agencia Estatal de Investigación (España), and Eusko Jaurlaritza
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Chemistry ,Light ,Polymers ,Physics ,Metal Nanoparticles ,General Materials Science ,Gold ,Physical and Theoretical Chemistry ,Engineering sciences. Technology ,Catalysis - Abstract
Plasmonic catalysis in the colloidal phase requires robust surface ligands that prevent particles from aggregation in adverse chemical environments and allow carrier flow from reagents to nanoparticles. This work describes the use of a water-soluble conjugated polymer comprising a thiophene moiety as a surface ligand for gold nanoparticles to create a hybrid system that, under the action of visible light, drives the conversion of the biorelevant NAD+ to its highly energetic reduced form NADH. A combination of advanced microscopy techniques and numerical simulations revealed that the robust metal–polymer heterojunction, rich in sulfonate functional groups, directs the interaction of electron-donor molecules with the plasmonic photocatalyst. The tight binding of polymer to the gold surface precludes the need for conventional transition-metal surface cocatalysts, which were previously shown to be essential for photocatalytic NAD+ reduction but are known to hinder the optical properties of plasmonic nanocrystals. Moreover, computational studies indicated that the coating polymer fosters a closer interaction between the sacrificial electron-donor triethanolamine and the nanoparticles, thus enhancing the reactivity., This work was supported by grant PID2019-111772RB-I00 funded by MCIN/AEI/10.13039/501100011033 and grant IT 1254-19 funded by Basque Government. The authors acknowledge the financial support of the European Commission (EUSMI, Grant 731019). S.B. is grateful to the European Research Council (ERC-CoG-2019 815128).
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- 2022
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10. Strong exciton−photon coupling with colloidal quantum dots in a tunable microcavity
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Igor Nabiev, Pavel Samokhvalov, Konstantin Mochalov, Yury P. Rakovich, Ivan Vaskan, Maksim Lednev, Dmitriy Dovzhenko, University of Southampton, The National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) [Moscow, Russia], Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry (IBCh RAS), Russian Academy of Sciences [Moscow] (RAS), Basque Foundation for Science (Ikerbasque), Laboratoire de Recherche en Nanosciences - EA 4682 (LRN), Université de Reims Champagne-Ardenne (URCA)-SFR CAP Santé (Champagne-Ardenne Picardie Santé), Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-SFR Condorcet, and Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)
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Photon ,Materials science ,Photoluminescence ,Physics and Astronomy (miscellaneous) ,Exciton ,Physics::Optics ,FOS: Physical sciences ,02 engineering and technology ,01 natural sciences ,7. Clean energy ,Condensed Matter::Materials Science ,0103 physical sciences ,Mesoscale and Nanoscale Physics (cond-mat.mes-hall) ,Polariton ,[SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics ,010306 general physics ,Quantum ,Condensed Matter::Quantum Gases ,Coupling ,Condensed Matter - Materials Science ,Condensed Matter - Mesoscale and Nanoscale Physics ,business.industry ,Condensed Matter::Other ,Materials Science (cond-mat.mtrl-sci) ,021001 nanoscience & nanotechnology ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,3. Good health ,Quantum dot ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,Optoelectronics ,Photonics ,0210 nano-technology ,business - Abstract
Polariton emission from optical cavities integrated with various luminophores has been extensively studied recently due to the wide variety of possible applications in photonics, particularly promising in terms of fabrication of low-threshold sources of coherent emission. Tuneable microcavities allow extensive investigation of the photophysical properties of matter placed inside the cavity by deterministically changing the coupling strength and controllable switching from weak to strong and ultra-strong coupling regimes. Here we demonstrate room temperature strong coupling of exciton transitions in CdSe/ZnS/CdS/ZnS colloidal quantum dots with the optical modes of a tuneable low-mode-volume microcavity. Strong coupling is evidenced by a large Rabi splitting of the photoluminescence spectra depending on the detuning of the microcavity. A coupling strength of 154 meV has been achieved. High quantum yields, excellent photostability, and scalability of fabrication of QDs paves the way to practical applications of coupled systems based on colloidal QDs in photonics, optoelectronics, and sensing., Comment: 14 pages, 3 figures
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- 2021
11. Double Rabi Splitting in a Strongly Coupled System of Core–Shell Au@Ag Nanorods and J-Aggregates of Multiple Fluorophores
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Ana Sánchez-Iglesias, Luis M. Liz-Marzán, Dzmitry Melnikau, Yury P. Rakovich, Alexander A. Govyadinov, Marek Grzelczak, Igor Nabiev, CICNanoGUNE, Carbon Bionanotechnology Laboratory (CICbiomaGUNE), Donostia International Physics Center - DIPC (SPAIN), Donostia International Physics Center (DIPC), University of the Basque Country/Euskal Herriko Unibertsitatea (UPV/EHU)-University of the Basque Country/Euskal Herriko Unibertsitatea (UPV/EHU), Laboratoire de Recherche en Nanosciences - EA 4682 (LRN), SFR Condorcet, Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Université de Reims Champagne-Ardenne (URCA)-SFR CAP Santé (Champagne-Ardenne Picardie Santé), Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV), University of the Basque Country/Euskal Herriko Unibertsitatea (UPV/EHU), Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Ministry of Education and Science of the Russian Federation, Eusko Jaurlaritza, Melnikau, D. [0000-0002-6588-8122], Grzelczak, Marek [0000-0002-3458-8450], Nabiev, Igor [0000-0002-8391-040X], Liz-Marzán, Luis Manuel [0000-0002-6647-1353], Rakovich, Yury P. [0000-0003-0111-2920], Melnikau, D., Grzelczak, Marek, Nabiev, Igor, Liz-Marzán, Luis Manuel, and Rakovich, Yury P.
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Strongly coupled ,Multi-mode optical fiber ,Materials science ,Energy transfer ,Physics::Optics ,macromolecular substances ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,7. Clean energy ,Molecular physics ,0104 chemical sciences ,Core shell ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,Strong coupling ,General Materials Science ,Nanorod ,[SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics ,Physical and Theoretical Chemistry ,0210 nano-technology ,J-aggregate ,ComputingMilieux_MISCELLANEOUS - Abstract
The interaction of several components in the strong coupling regime yielding multiple Rabi splittings opens up remarkable possibilities for studies of multimode hybridization and energy transfer, which is of considerable interest in both fundamental and applied science. Here we demonstrate that three different components, such as core−shell Au@Ag nanorods and J-aggregates of two different dyes, can be integrated into a single hybrid structure, which leads to strong collective exciton− plasmon coupling and double-mode Rabi splitting totaling 338 meV. We demonstrate strong coupling in these multicomponent plexitonic nanostructures by means of magnetic circular dichroism spectroscopy and demonstrate strong magneto-optical activity for the three hybridized states resulting from this coupling. The J-aggregates of two different nonmagnetic dyes interact with metal nanoparticles effectively, achieving magnetic properties due to the hybridization of electronic excitations in the threecomponent system., This work was supported by MINECO (Ministerio de Economiá y Competitividad), Spain, Projects FIS2016-80174-P (PLASMOQUANTA) and MAT2017-86659-R (MULTIMAGE). I.R.N. and Y.P.R. acknowledge support from the Ministry of Education and Science of the Russian Federation under Grant No. 14.Y26.31.0011 and funding from the Basque Government (Grant No. IT1164-19). This work was coordinated under the Maria de Maeztu Units of Excellence Program from the Spanish State Research Agency (Grant No. MDM-2017-0720).
- Published
- 2019
12. Photocatalytic cofactor regeneration involving triethanolamine revisited: The critical role of glycolaldehyde
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Jie Liu, Wojciech Bartkowiak, Karolina Kinastowska, Marek Grzelczak, John M. Tobin, Filipe Vilela, Yury P. Rakovich, Zhengtao Xu, and Ministry of Education and Science of the Russian Federation
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Reducing agent ,Triethanolamine ,Electron donor ,02 engineering and technology ,Nicotinamide adenine dinucleotide ,010402 general chemistry ,01 natural sciences ,Redox ,Catalysis ,Cofactor ,chemistry.chemical_compound ,medicine ,General Environmental Science ,Glycolaldehyde ,biology ,Process Chemistry and Technology ,021001 nanoscience & nanotechnology ,Combinatorial chemistry ,0104 chemical sciences ,chemistry ,Microporous conjugated polymer ,biology.protein ,Photocatalysis ,NADH photoregeneration ,0210 nano-technology ,medicine.drug - Abstract
Triethanolamine is a widely used model electron donor that enables a fast screening of the photocatalyst parameters in both, homogeneous and heterogeneous scenarios. We report a new role of triethanolamine in heterogeneous photoregeneration of cofactor molecules – nicotinamide adenine dinucleotide (NADH) – using state-of-the-art heterogeneous photocatalysts. In contrast to the common model involving the light-induced electrons and holes generation to reduce the substrate and oxidize triethanolamine simultaneously, we identified glycolaldehyde as a stable product of triethanolamine degradation capable of reducing NAD+. Triethanolamine, apart from playing a role of a precursor for reducing agent, maintains the alkalinity of the solution to drive the reduction. Our findings offer a fresh insight into the triethanolamine-assisted photocatalysis because glycolaldehyde as such have generally been neglected in mechanistic considerations. Moreover, a spatial and temporal decoupling of the photocatalyst from the substrate reduction reaction minimizes the product re-oxidation, thus implying a relevant feature for the real-world applications using a continuous flow setting., F. V. would like to thank ScotChem for the financial support. Y. R. would like to thank The Ministry of Education and Science of the Russian Federation (grant no. 14.Y26.31.0011).
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- 2019
13. Polariton-assisted manipulation of energy relaxation pathways: donor–acceptor role reversal in a tuneable microcavity
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Konstantin Mochalov, Dmitriy Dovzhenko, Maksim Lednev, Yury P. Rakovich, Ivan Vaskan, Igor Nabiev, Alexander Karaulov, Ministry of Education and Science of the Russian Federation, Ministère de l’Enseignement supérieur et de la Recherche (France), Université de Reims Champagne-Ardenne, Russian Science Foundation, Eusko Jaurlaritza, University of Southampton, The National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) [Moscow, Russia], Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry (IBCh RAS), Russian Academy of Sciences [Moscow] (RAS), Donostia International Physics Center (DIPC), University of the Basque Country [Bizkaia] (UPV/EHU), Sechenov First Moscow State Medical University, Laboratoire de Recherche en Nanosciences - EA 4682 (LRN), Université de Reims Champagne-Ardenne (URCA)-SFR CAP Santé (Champagne-Ardenne Picardie Santé), Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-SFR Condorcet, Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS), and Moscow State Engineering Physics Institute (MEPhI)
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Photon ,Exciton ,Physics::Optics ,fluorescent molecules ,02 engineering and technology ,010402 general chemistry ,7. Clean energy ,01 natural sciences ,law.invention ,Condensed Matter::Materials Science ,law ,Polariton ,Energy level ,tuneable microcavity ,Physics::Chemical Physics ,hybridization ,Relaxation (NMR) ,General Chemistry ,021001 nanoscience & nanotechnology ,Acceptor ,0104 chemical sciences ,[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry ,Chemistry ,Förster resonance energy transfer ,Chemical physics ,Optical cavity ,FRET ,0210 nano-technology ,polaritons ,relaxation pathways - Abstract
Resonant interaction between excitonic transitions of molecules and localized electromagnetic field allows the formation of hybrid light–matter polaritonic states. This hybridization of the light and the matter states has been shown to significantly alter the intrinsic properties of molecular ensembles placed inside the optical cavity. Here, we have observed strong coupling of excitonic transition in a pair of closely located organic dye molecules demonstrating an efficient donor-to-acceptor resonance energy transfer with the mode of a tuneable open-access cavity. Analysing the dependence of the relaxation pathways between energy states in this system on the cavity detuning, we have demonstrated that predominant strong coupling of the cavity photon to the exciton transition in the donor dye molecule can lead not only to an increase in the donor–acceptor energy transfer, but also to an energy shift large enough to cause inversion between the energy states of the acceptor and the mainly donor lower polariton energy state. Furthermore, we have shown that the polariton-assisted donor–acceptor chromophores' role reversal or “carnival effect” not only changes the relative energy levels of the donor–acceptor pair, but also makes it possible to manipulate the energy flow in the systems with resonant dipole–dipole interaction and direct energy transfer from the acceptor to the mainly donor lower polariton state. Our experimental data are the first confirmation of the theoretically predicted possibility of polariton-assisted energy transfer reversal in FRET systems, thus paving the way to new avenues in FRET-imaging, remote-controlled chemistry, and all-optical switching., This study was supported by the Ministry of Education and Science of the Russian Federation (grant no. 14.Y26.31.0011). I. N. acknowledges the support from the Ministry of Higher Education, Research and Innovation of the French Republic and the University of Reims Champagne-Ardenne. The part of the work devoted to the microresonator development and adaptation was supported by the Russian Science Foundation (grant no. 21-79-30048). Y. R. acknowledges the support from the Basque Government (grant no. IT1164-19).
- Published
- 2021
14. Strong increase in the effective two-photon absorption cross-section of excitons in quantum dots due to the nonlinear interaction with localized plasmons in gold nanorods
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Yury P. Rakovich, Victor Krivenkov, Pavel Samokhvalov, Ana Sánchez-Iglesias, Igor Nabiev, Marek Grzelczak, The National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) [Moscow, Russia], CIC BiomaGUNE, CIC BiomaGUNE [Espagne], Donostia International Physics Center - DIPC (SPAIN), Donostia International Physics Center (DIPC), University of the Basque Country/Euskal Herriko Unibertsitatea (UPV/EHU)-University of the Basque Country/Euskal Herriko Unibertsitatea (UPV/EHU), Laboratoire de Recherche en Nanosciences - EA 4682 (LRN), SFR Condorcet, Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Université de Reims Champagne-Ardenne (URCA)-SFR CAP Santé (Champagne-Ardenne Picardie Santé), Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV), Ikerbasque - Basque Foundation for Science, Russian Science Foundation, Ministry of Education and Science of the Russian Federation, Eusko Jaurlaritza, Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), Université de Reims Champagne-Ardenne, and Ministre de l'Enseignement Supérieur, de la Recherche et de l'Innovation (France)
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Plasmonic nanoparticles ,Photoluminescence ,Materials science ,business.industry ,Exciton ,02 engineering and technology ,Purcell effect ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Two-photon absorption ,3. Good health ,0104 chemical sciences ,Quantum dot ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,Optoelectronics ,General Materials Science ,Nanorod ,[SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics ,0210 nano-technology ,business ,Plasmon - Abstract
Excitons in semiconductor quantum dots (QDs) feature high values of the two-photon absorption cross-sections (TPACSs), enabling applications of two-photon-excited photoluminescence (TPE PL) of QDs in biosensing and nonlinear optoelectronics. However, efficient TPE PL of QDs requires high-intensity laser fields, which limits these applications. There are two possible ways to increase the TPE PL of QDs: by increasing their photoluminescence quantum yield (PLQY) or by further increasing the TPACS. Plasmonic nanoparticles (PNPs) may act as open nanocavities for increasing the PLQY via the Purcell effect, but this enhancement is strictly limited by the maximum possible PLQY value of 100%. Here we directly investigated the effect of PNPs on the effective TPACS of excitons in QDs. We have found that effective TPACS of excitons in a QD–PMMA thin film can be increased by a factor of up to 12 near the linearly excited gold nanorods (GNRs). Using gold nanospheres (GNSs), in which plasmons cannot be excited in the infrared range, as a control system, we have shown that, although both GNSs and GNRs increase the recombination rate of excitons, the TPACS is increased only in the case of GNRs. We believe that the observed effect of TPACS enhancement is a result of the nonlinear interaction of the plasmons in GNRs with excitons in QDs, which we have supported by numerical simulations. The results show the way to the rational design of the spectral features of plasmon–exciton hybrids for using them in biosensing and nonlinear optoelectronics., V. K. acknowledges support from the Russian Science Foundation (Grant No. 18-72-10143) for the part of the study related to the investigation of the effects of PNPs on the effective TPACS of excitons in QDs and numerical simulations of these effects. Support from the Ministry of Education and Science of the Russian Federation (Grant No. 14.Y26.31.0011) for the part of this study related to the synthesis and functionalisation of the QDs and engineering of hybrid QD-GNR materials is also acknowledged. Y. R. acknowledges the support from the Basque Government (grant no. IT1164-19). Y. R. and M. G. acknowledge the support from the Spanish MINECO (PID2019-111772RB-I00). I. N. acknowledges the Ministry of Higher Education, Research and Innovation of the French Republic and Université de Reims Champagne-Ardenne.
- Published
- 2021
15. Strong coupling effects in a plexciton system of gold nanostars and J-aggregates
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Ana Sánchez-Iglesias, Yury P. Rakovich, Dzmitry Melnikau, Igor Nabiev, Pavel Samokhvalov, Marek Grzelczak, Centro de Fisica de Materiales (CFM), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC)-Universidad del Pais Vasco / Euskal Herriko Unibertsitatea [Espagne] (UPV/EHU), The National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) [Moscow, Russia], Basque Research and Technology Alliance (BRTA), Donostia International Physics Center - DIPC (SPAIN), Donostia International Physics Center (DIPC), University of the Basque Country/Euskal Herriko Unibertsitatea (UPV/EHU)-University of the Basque Country/Euskal Herriko Unibertsitatea (UPV/EHU), Laboratoire de Recherche en Nanosciences - EA 4682 (LRN), SFR Condorcet, Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Université de Reims Champagne-Ardenne (URCA)-SFR CAP Santé (Champagne-Ardenne Picardie Santé), Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV), Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Ministerio de Economía y Competitividad (España), Ministry of Science and Higher Education of the Russian Federation, Eusko Jaurlaritza, Russian Science Foundation, and Université de Reims Champagne-Ardenne
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Plasmons ,Luminescence ,Materials science ,Exciton ,Biophysics ,Physics::Optics ,02 engineering and technology ,Purcell effect ,01 natural sciences ,Biochemistry ,J-aggregates ,0103 physical sciences ,Spontaneous emission ,[SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics ,010306 general physics ,Absorption (electromagnetic radiation) ,J-aggregate ,Plasmon ,Strong coupling ,Scattering ,Nanostars ,General Chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,Chemical physics ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,Nanoparticles ,Excitons ,0210 nano-technology - Abstract
Strong exciton–plasmon interaction enables effective control of the photonic properties of hybrid organic–inorganic nanostructures encompassing light absorption, scattering and luminescence. Whereas the manifestations of light-matter interactions in the absorption and scattering are reasonably well understood their relation to the luminescence as well as luminescence properties themselves in strongly coupled plexcitonic hybrids is still largely underexplored especially for a system with a complex mechanism of hybridisation of states. Here we report on investigation of the interaction between localized and hybridized plasmons in gold nanostars and excitons in J-aggregates under ambient conditions. Our findings demonstrate the quality performance of the formed plexciton system with multiple hybridization channels in terms of the parameters of strong coupling, such as Rabi splitting (230 meV), coupling-strength-to-transition energy ratio (0.07), and cooperativity (2.03). The results of time-resolved experiments elucidate the observed enhanced spontaneous emission rate with regard to the Purcell effect, whose value was estimated from the extinction spectra of the strongly coupled plexciton system., Financial supports from Projects PID2019-111772RB-I00 of the Spanish MINECO and the Ministry of Science and Higher Education of the Russian Federation (Grant No. 14.Y26.31.0011) are acknowledged. Y. R. acknowledges the support from the Basque Government (grant no. IT1164-19). P.S. and I.N acknowledge support from the Russian Science Foundation (grant no. 21-79-30048) of the part of this work related to nanomaterials manufacturing and functionalisation. I.N. acknowledges support from the Université de Reims Champagne-Ardenne. A.S.-I. acknowledges the Maria de Maeztu Units of Excellence Program from the Spanish State Research Agency (Grant No. MDM-2017-0720).
- Published
- 2022
16. Long-range coupling of individual quantum dots with plasmonic nanoparticles in a thin-film hybrid material
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Victor Krivenkov, Igor Nabiev, Pavel Samokhvalov, Daria V. Dyagileva, Yury P. Rakovich, The National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) [Moscow, Russia], Laboratoire de Recherche en Nanosciences - EA 4682 (LRN), Université de Reims Champagne-Ardenne (URCA)-SFR CAP Santé (Champagne-Ardenne Picardie Santé), Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-SFR Condorcet, and Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics] ,Plasmonic nanoparticles ,Photoluminescence ,Materials science ,business.industry ,Exciton ,[CHIM.MATE]Chemical Sciences/Material chemistry ,02 engineering and technology ,Purcell effect ,021001 nanoscience & nanotechnology ,7. Clean energy ,01 natural sciences ,010309 optics ,Quantum dot ,0103 physical sciences ,Optoelectronics ,[PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph] ,Thin film ,0210 nano-technology ,business ,Absorption (electromagnetic radiation) ,ComputingMilieux_MISCELLANEOUS ,Plasmon - Abstract
Semiconductor quantum dots (QDs) are widely used in photovoltaic and optoelectronic devices due to their unique optical properties. Photoluminescence (PL) properties of QDs can be significantly improved by their electromagnetic coupling with plasmonic nanoparticles (PNPs). The excitation of resonant localized plasmon modes leads to the enhancement of the density of photon states and increase of electromagnetic field near the surface of PNPs, what boosts the acceleration of the exciton radiative decay, known as the Purcell effect. To study the dependence of the degree of acceleration of radiative decay rate (Purcell factor) on the distance between QDs and PNPs, we fabricated thin-film hybrid structures based on CdSe(core)/ZnS/CdS/ZnS(multishell) QDs and silver or gold PNPs with a controllable distance between these components. The change in the radiative decay rate of excitons was calculated from the PL intensities and lifetimes before and after the deposition of PNPs on top of the QD thin film covered by a poly(methyl methacrylate) (PMMA) spacer. For both PNP types, the PL lifetime of underlying QDs decreased, whereas the PL intensity of the latter decreased only slightly for gold PNPs and even increased for silver PNPs. This indicates the acceleration of QDs radiative decay (Purcell effect) mediated by exciton-plasmon interaction. The Purcell factor was higher for silver PNPs than that for gold PNPs, what can be explained by the better spectral overlap between the QDs PL band and silver PNPs absorbance and the absence of interband absorption in silver at the wavelength of QDs PL. The results of this study provide better understanding of the Purcell effects in hybrid materials based on QDs and PNPs.
- Published
- 2020
17. Enhancement of the quantum dot photoluminescence using transfer-printed porous silicon microcavities
- Author
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Yury P. Rakovich, Dmitriy Dovzhenko, I. S. Kryukova, Igor Nabiev, The National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) [Moscow, Russia], Laboratoire de Recherche en Nanosciences - EA 4682 (LRN), Université de Reims Champagne-Ardenne (URCA)-SFR CAP Santé (Champagne-Ardenne Picardie Santé), Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-SFR Condorcet, and Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
History ,Photoluminescence ,Materials science ,Exciton ,Physics::Optics ,02 engineering and technology ,Porous silicon ,01 natural sciences ,Education ,Monocrystalline silicon ,0103 physical sciences ,[PHYS.COND]Physics [physics]/Condensed Matter [cond-mat] ,010306 general physics ,ComputingMilieux_MISCELLANEOUS ,Photonic crystal ,[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics] ,Condensed Matter::Other ,business.industry ,[CHIM.MATE]Chemical Sciences/Material chemistry ,021001 nanoscience & nanotechnology ,Computer Science Applications ,Quantum dot ,Optoelectronics ,Photonics ,0210 nano-technology ,business ,Luminescence - Abstract
Enhancement of the photoluminescence signal intensity from organic and inorganic fluorophores increases the sensitivity of operation of optical sensors, detectors, and photonic diagnostic assays. Here, we have engineered and compared optical and fluorescence-enhancing properties of two types of one-dimensional porous silicon photonic crystals: a transfer-printed microcavity based on the freestanding photonic crystal and a conventional “one-piece” microcavity created on a monocrystalline silicon substrate. Comparative analysis of the eigenmodes and the photonic bandgaps of both types of microcavities demonstrated a high quality of transfer-printed microcavities and good correlation of their reflection spectra with the spectra of “one-piece” microcavities. Moreover, embedding of a highly concentrated solution of quantum dots (QDs) in the eigenmode localization region of transfer-printed microcavity was followed by three-fold reduction of the full-width-at-half-maximum of their luminescence spectrum at the microcavity eigenmode wavelength, thus confirming a weak coupling regime of QD exciton and microcavity eigenmode interaction and significant enhancement of QD luminescence within the microcavity.
- Published
- 2020
18. Enhancement of the photoluminescence of semiconductor nanocrystals in transfer-printed microcavities based on freestanding porous silicon photonic crystals
- Author
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Igor Nabiev, Dmitriy Dovzhenko, Yury P. Rakovich, I. S. Kryukova, The National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) [Moscow, Russia], Laboratoire de Recherche en Nanosciences - EA 4682 (LRN), Université de Reims Champagne-Ardenne (URCA)-SFR CAP Santé (Champagne-Ardenne Picardie Santé), Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-SFR Condorcet, and Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
History ,[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics] ,Photoluminescence ,Materials science ,business.industry ,Physics::Optics ,02 engineering and technology ,[CHIM.MATE]Chemical Sciences/Material chemistry ,021001 nanoscience & nanotechnology ,Porous silicon ,01 natural sciences ,Computer Science Applications ,Education ,0103 physical sciences ,Optoelectronics ,Semiconductor nanocrystals ,[PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph] ,010306 general physics ,0210 nano-technology ,business ,ComputingMilieux_MISCELLANEOUS ,Photonic crystal - Abstract
Today, lots of research address the phenomenon of interaction between light and matter. In particular, it is of a special interest to investigate light–matter interaction in one-dimensional resonators based on porous materials. In this case, one can embed emitting semiconductor particles into the porous resonator, where the excitons of these particles couple to the resonator eigenmode and luminescence intensity of the emitters is enhanced, allowing an increase in the sensitivity of optical sensors, detectors, and photonic diagnostic assays. A particular challenge is to place the emitters directly in the antinode region of the resonator eigenmode in order to maximize the coupling strength, which is sometimes a problem due to the spatial distribution of emitters away from the eigenmode localization region. Here, we have shown that the transfer-printing technique can be used to obtain structures based on freestanding porous silicon photonic crystals capable of precisely controlling the emitter spatial distribution about the eigenmode localization region. This, as well as the porosity of these structures and high adsorption capacity of porous silicon, allows the light–matter interaction in these hybrid structures to be used in sensing applications. We have shown that the transfer-printing method does not worsen the optical properties of the microcavities compared to the conventional electrochemical etching of the whole microcavity at a time. Furthermore, we have observed slightly better coupling of the exciton of the emitter to the eigenmode of the transfer-printed microcavity in the weak coupling regime.
- Published
- 2020
19. Effect of spectral overlap and separation distance on exciton and biexciton quantum yields and radiative and nonradiative recombination rates in quantum dots near plasmon nanoparticles
- Author
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Pavel Samokhvalov, Igor Nabiev, Daria V. Dyagileva, Victor Krivenkov, Yury P. Rakovich, Ministry of Science and Higher Education of the Russian Federation, Eusko Jaurlaritza, The National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) [Moscow, Russia], Laboratoire de Recherche en Nanosciences - EA 4682 (LRN), Université de Reims Champagne-Ardenne (URCA)-SFR CAP Santé (Champagne-Ardenne Picardie Santé), Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-SFR Condorcet, Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS), Centro de Fisica de Materiales (CFM), and Consejo Superior de Investigaciones Científicas [Madrid] (CSIC)-Universidad del Pais Vasco / Euskal Herriko Unibertsitatea [Espagne] (UPV/EHU)
- Subjects
Plasmons ,Exciton ,General Physics and Astronomy ,02 engineering and technology ,Purcell effect ,01 natural sciences ,[SPI.MAT]Engineering Sciences [physics]/Materials ,0103 physical sciences ,Radiative transfer ,Biexciton ,[SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics ,010306 general physics ,Quantum ,Plasmon ,ComputingMilieux_MISCELLANEOUS ,Physics ,Excitation enhancement ,[CHIM.MATE]Chemical Sciences/Material chemistry ,021001 nanoscience & nanotechnology ,Quantum dot ,Energy transfer ,[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,[PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph] ,Atomic physics ,0210 nano-technology ,Recombination - Abstract
Efficient biexciton (BX) photoluminescence (PL) from quantum dots (QDs) paves the way to the generation of entangled photons and related applications. However, the quantum yield (QY) of BX PL is much lower than that for single excitons (EX) due to efficient Auger-like recombination. In the vicinity of plasmon nanoparticles, the recombination rates of EX and BX may be affected by the Purcell effect, fluorescence quenching, and the excitation rate enhancement. Here, the effect of the plasmon resonance spectral position on the EX and BX PL is experimentally studied in two cases: when the plasmon band overlaps with the excitation wavelength and when it coincides with the QDs PL band. In the first case, the EX and BX excitation efficiencies are significantly increased but the EX QY reduced. As a result, the BX-to-EX QY ratio is higher than 1 at plasmon–exciton systems separations shorter than 40 nm. In the second case, the radiative recombination rates are enhanced by several orders of magnitude, which led to an increase in BX QY over distances of up to 90 nm. Finally, these two effects are obtained in the same hybrid structure, with the resultant increase in both excitation efficiency and QY of BX PL., They also acknowledge the financial support from theMinistry of Science and Higher Education of the Russian Federation (Grant Number: 14.Y26.31.0011) . Y.R. acknowledges the support from the Basque Government (IT1164‐19)
- Published
- 2020
20. Strongly coupled exciton–plasmon nanohybrids reveal extraordinary resistance to harsh environmental stressors: temperature, pH and irradiation
- Author
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Yury P. Rakovich, Ana Sánchez-Iglesias, Thomas Hendel, Victor Krivenkov, Marek Grzelczak, Eusko Jaurlaritza, Diputación Foral de Guipúzcoa, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), and Ministry of Science and Higher Education of the Russian Federation
- Subjects
Strongly coupled ,Plasmonic nanoparticles ,Nanostructure ,Materials science ,Exciton ,Nanoparticle ,Nanotechnology ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,0103 physical sciences ,Strong coupling ,General Materials Science ,Irradiation ,010306 general physics ,0210 nano-technology ,Plasmon - Abstract
Hybridized plexcitonic states have unique properties which have been widely studied in recent decades in many research fields targeted at both fundamental science and innovative applications. However, to make these applications come true one needs to ensure the stabilization and preservation of electronic states and optical transitions in hybrid nanostructures, especially under the influence of external stressors, in regimes, that have not yet been comprehensively investigated. The present work shows that the nanohybrid system, composed of plasmonic nanoparticles and J-aggregates of organic molecules, displays outstanding resistance to harsh environmental stressors such as temperature, pH and strong light irradiation as well as demonstrates long-term stability and processability of the nanostructures both in weak and strong coupling regimes. These findings contribute to a deeper understanding of the physicochemical properties of plexcitonic nanoparticles and may find important implications for the development of potential applications in optoelectronics, optical imaging and chemo-bio-sensing and, in general, in the field of optical materials science., Authors acknowledge the financial support from the Ministry of Education and Science of the Russian Federation (grant no. 14.Y26.31.0011). Y. R. acknowledges the support from the Basque Government (grant no. IT1164-19). M. G. acknowledges support from the Basque Government (PIBA 2018-34), and Diputación Foral de Guipúzcoa (RED 2018, RED 2019). A. S. I. acknowledges the Maria de Maeztu Units of Excellence Programme – Grant No. MDM-2017-0720 Ministry of Science, Innovation and Universities.
- Published
- 2020
21. Light–matter interaction in the strong coupling regime: configurations, conditions, and applications
- Author
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Sergey V. Ryabchuk, Igor Nabiev, Dmitry S. Dovzhenko, Yury P. Rakovich, The National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) [Moscow, Russia], Ikerbasque - Basque Foundation for Science, Laboratoire de Recherche en Nanosciences - EA 4682 (LRN), Université de Reims Champagne-Ardenne (URCA)-SFR CAP Santé (Champagne-Ardenne Picardie Santé), Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-SFR Condorcet, and Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Quantum optics ,Electromagnetic field ,Physics ,business.industry ,Nonlinear optics ,02 engineering and technology ,Quantum channel ,021001 nanoscience & nanotechnology ,01 natural sciences ,7. Clean energy ,Resonance (particle physics) ,Computational physics ,symbols.namesake ,Coupling (physics) ,0103 physical sciences ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,symbols ,General Materials Science ,[SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics ,Photonics ,010306 general physics ,0210 nano-technology ,business ,Raman scattering - Abstract
International audience; Resonance interaction between a molecular transition and a confined electromagnetic field can reach the coupling regime where coherent exchange of energy between light and matter becomes reversible. In this case, two new hybrid states separated in energy are formed instead of independent eigenstates, which is known as Rabi splitting. This modification of the energy spectra of the system offers new possibilities for controlled impact on various fundamental properties of coupled matter (such as the rate of chemical reactions and the conductivity of organic semiconductors). To date, the strong coupling regime has been demonstrated in many configurations under different ambient conditions. However, there is still no comprehensive approach to determining parameters for achieving the strong coupling regime for a wide range of practical applications. In this review, a detailed analysis of various systems and corresponding conditions for reaching strong coupling is carried out and their advantages and disadvantages, as well as the prospects for application, are considered. The review also summarizes recent experiments in which the strong coupling regime has led to new interesting results, such as the possibility of collective strong coupling between X-rays and matter excitation in a periodic array of Fe isotopes, which extends the applications of quantum optics; a strong amplification of the Raman scattering signal from a coupled system, which can be used in surface-enhanced and tip-enhanced Raman spectroscopy; and more efficient second-harmonic generation from the low polaritonic state, which is promising for nonlinear optics. The results reviewed demonstrate great potential for further practical applications of strong coupling in the fields of photonics (low-threshold lasers), quantum communications (switches), and biophysics (molecular fingerprinting).
- Published
- 2018
22. Strong Magneto-Optical Response of Nonmagnetic Organic Materials Coupled to Plasmonic Nanostructures
- Author
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Marek Grzelczak, Ana Sánchez-Iglesias, Luis M. Liz-Marzán, Dzmitry Melnikau, Yury P. Rakovich, Alexander A. Govyadinov, European Commission, European Research Council, and Ministerio de Economía y Competitividad (España)
- Subjects
Plexciton ,Letter ,Physics::Optics ,Nanoparticle ,02 engineering and technology ,Magneto-optical activity ,7. Clean energy ,01 natural sciences ,Light scattering ,plexciton ,magneto-plasmonics ,General Materials Science ,Absorption (electromagnetic radiation) ,sensing ,Strong coupling ,j-aggregates ,Magnetic circular dichroism ,nanoscale ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,provides ,circular-dichroism ,Magneto-plasmonics ,symbols ,Optoelectronics ,fluorescence ,0210 nano-technology ,nanosensors ,Materials science ,spectra ,Exciton ,Bioengineering ,010402 general chemistry ,J-aggregates ,symbols.namesake ,magnetoplasmonics ,strong coupling ,enhancement ,magneto-optical activity ,Plasmon ,Plasmonic nanoparticles ,business.industry ,Mechanical Engineering ,General Chemistry ,gold nanorods ,0104 chemical sciences ,Sensing ,nanoparticles ,business ,Raman spectroscopy - Abstract
Plasmonic nanoparticles (PNPs) can significantly modify the optical properties of nearby organic molecules and thus present an attractive opportunity for sensing applications. However, the utilization of PNPs in conventional absorption, fluorescence, or Raman spectroscopy techniques is often ineffective due to strong absorption background and light scattering, particularly in the case of turbid solutions, cell suspensions, and biological tissues. Here we show that nonmagnetic organic molecules may exhibit magneto-optical response due to binding to a PNP. Specifically, we detect strong magnetic circular dichroism signal from supramolecular J-aggregates, a representative organic dye, upon binding to silver-coated gold nanorods. We explain this effect by strong coupling between the J-aggregate exciton and the nanoparticle plasmon, leading to the formation of a hybrid state in which the exciton effectively acquires magnetic properties from the plasmon. Our findings are fully corroborated by theoretical modeling and constitute a novel magnetic method for chemo- and biosensing, which (upon adequate PNP functionalization) is intrinsically insensitive to the organic background and thus offers a significant advantage over conventional spectroscopy techniques., We acknowledge financial support from Project Fis2016.80174-P (PLASMOQUANTA) from MINECO (Ministerio de Economia y Competitividad). L.L.-M. acknowledges funding from the European Research Council (ERC Advanced Grant 267867, Plasmaquo).
- Published
- 2017
23. Spectral and spatial characteristics of the electromagnetic modes in a tunable optical microcavity cell for studying hybrid light–matter states
- Author
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Yury P. Rakovich, Ivan Vaskan, Igor Nabiev, Dmitriy Dovzhenko, Konstantin Mochalov, Ministry of Education and Science of the Russian Federation, The National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) [Moscow, Russia], Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry (IBCh RAS), Russian Academy of Sciences [Moscow] (RAS), University of the Basque Country [Bizkaia] (UPV/EHU), Laboratoire de Recherche en Nanosciences - EA 4682 (LRN), Université de Reims Champagne-Ardenne (URCA)-SFR CAP Santé (Champagne-Ardenne Picardie Santé), Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-SFR Condorcet, and Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Electromagnetic field ,Physics and Astronomy (miscellaneous) ,Solid-state physics ,01 natural sciences ,7. Clean energy ,010305 fluids & plasmas ,law.invention ,symbols.namesake ,law ,0103 physical sciences ,[SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics ,010306 general physics ,ComputingMilieux_MISCELLANEOUS ,Physics ,Mode volume ,business.industry ,4. Education ,Resonance ,Optical microcavity ,Q factor ,symbols ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,Optoelectronics ,Material properties ,business ,Raman scattering - Abstract
Studies of resonance interaction between matter and localized electromagnetic field in a cavity have recently attracted much interest because they offer the possibility of controllably modifying some of the fundamental material properties. However, despite the large number of such studies, these is no universal approach that would allow investigation of sets of different samples with wide variation of the main experimental parameters of the optical modes. In this work, the main optical parameters of a previously developed universal tunable microcavity cell, i.e., the Q factor and mode volume, as well as their dependence on the characteristics of cavity mirrors and spacing between them, are analyzed. The results obtained will significantly expand the scope of applications of resonance interaction between light and matter, including such effects as the enhancement of Raman scattering, long-range resonance nonradiative energy transfer, and modification of chemical reaction rates., This work was supported by the Ministry of Science and Higher Education of the Russian Federation,contract no. 4.Y26.31.0011.
- Published
- 2019
24. Enhancement of Biexciton Emission Due to Long-Range Interaction of Single Quantum Dots and Gold Nanorods in a Thin-Film Hybrid Nanostructure
- Author
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Victor Krivenkov, Simon Goncharov, Marek Grzelczak, Pavel Samokhvalov, Ana Sánchez-Iglesias, Igor Nabiev, Yury P. Rakovich, The National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) [Moscow, Russia], CIC BiomaGUNE, CIC BiomaGUNE [Espagne], Laboratoire de Recherche en Nanosciences - EA 4682 (LRN), Université de Reims Champagne-Ardenne (URCA)-SFR CAP Santé (Champagne-Ardenne Picardie Santé), Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-SFR Condorcet, Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS), Center of Materials Physics CSIC-UPV / EHU and Donostia International Physics Center, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Krivenkov, Victor, Grzelczak, Marek, Nabiev, Igor, Rakovich, Yury P., Krivenkov, Victor [0000-0003-0280-2296], Grzelczak, Marek [0000-0002-3458-8450], Nabiev, Igor [0000-0002-8391-040X], and Rakovich, Yury P. [0000-0003-0111-2920]
- Subjects
010302 applied physics ,Plasmonic nanoparticles ,Nanostructure ,Materials science ,business.industry ,Quantum yield ,02 engineering and technology ,Purcell effect ,021001 nanoscience & nanotechnology ,01 natural sciences ,Quantum dot ,0103 physical sciences ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,Optoelectronics ,General Materials Science ,Nanorod ,Spontaneous emission ,Physical and Theoretical Chemistry ,[SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics ,0210 nano-technology ,business ,Biexciton ,ComputingMilieux_MISCELLANEOUS - Abstract
Semiconductor quantum dots (QDs) are known for their ability to exhibit multiphoton emission caused by recombination of biexcitons (BX). However, the quantum yield (QY) of BX emission is low due to the fast Auger process. Plasmonic nanoparticles (PNPs) provide an attractive opportunity to accelerate BX radiative recombination. Here, we demonstrate the PNPs induced distance-controlled enhancement of BX emission of single QDs. Studying the same single QD before and after its integration with the PNPs, we observed a plasmon-mediated increase in the QY of BX emission. Remarkably, the enhancement of BX emission remains pronounced even at distances of 170 nm. We attribute this effect to efficient coupling, which results in the trade-off between resonance energy transfer from QD to gold nanorods and the Purcell effect at small QD-PNP separations and the predominant influence of the Purcell effect at longer distances. Our findings constitute a reliable approach to managing the efficiency of multiexciton emission over a wide span of distances, thus paving the way for new applications., The authors acknowledge the financial support from the Ministry of Education and Science of the Russian Federation (Grant 14.Y26.31.0011). Y.R. acknowledges support from MINECO (Ministerio de Economiá y Competitividad, Spain), Project Fis2016.80174-P (PLASMOQUANTA).
- Published
- 2019
25. Polariton-assisted emission of strongly coupled organic dye excitons in a tunable optical microcavity
- Author
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Yury P. Rakovich, Ivan Vaskan, Igor Nabiev, Dmitriy Dovzhenko, I. S. Kryukova, Konstantin Mochalov, The National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) [Moscow, Russia], Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry (IBCh RAS), Russian Academy of Sciences [Moscow] (RAS), Laboratoire de Recherche en Nanosciences - EA 4682 (LRN), Université de Reims Champagne-Ardenne (URCA)-SFR CAP Santé (Champagne-Ardenne Picardie Santé), Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-SFR Condorcet, and Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Electromagnetic field ,[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics] ,Materials science ,Exciton ,Transition dipole moment ,Physics::Optics ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Molecular physics ,Optical microcavity ,law.invention ,Rhodamine 6G ,[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry ,Coupling (physics) ,Dipole ,chemistry.chemical_compound ,chemistry ,law ,0103 physical sciences ,Polariton ,[PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det] ,010306 general physics ,0210 nano-technology ,ComputingMilieux_MISCELLANEOUS - Abstract
Light-matter coupling between the molecular dipole transitions and a confined electromagnetic field provides the ability to control the fundamental properties of coupled matter. The use of tunable optical microcavities for electromagnetic field confinement allows one to affect the coupled state properties in a controllable manner, whereas the coupling strength in this system strongly depends on the transition dipole moment and a mode volume of the cavity. In this study we have demonstrated controllable emission of Rhodamine 6G organic molecules with relatively low and unoriented dipole moments in a strong coupling regime by placing them into a tunable Fabry-Perot microcavity.
- Published
- 2019
26. Polariton-assisted splitting of broadband emission spectra of strongly coupled organic dye excitons in tunable optical microcavity
- Author
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Igor Nabiev, Konstantin Mochalov, Ivan Vaskan, I. S. Kryukova, Dmitriy Dovzhenko, Yury P. Rakovich, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), The National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) [Moscow, Russia], Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry (IBCh RAS), Russian Academy of Sciences [Moscow] (RAS), Donostia International Physics Center (DIPC), University of the Basque Country/Euskal Herriko Unibertsitatea (UPV/EHU), Laboratoire de Recherche en Nanosciences - EA 4682 (LRN), SFR Condorcet, Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Université de Reims Champagne-Ardenne (URCA)-SFR CAP Santé (Champagne-Ardenne Picardie Santé), and Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)
- Subjects
Materials science ,Photoluminescence ,Exciton ,02 engineering and technology ,Purcell effect ,01 natural sciences ,7. Clean energy ,law.invention ,010309 optics ,Optics ,law ,0103 physical sciences ,Polariton ,Spontaneous emission ,Emission spectrum ,[SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics ,ComputingMilieux_MISCELLANEOUS ,business.industry ,Single-mode optical fiber ,021001 nanoscience & nanotechnology ,Optical microcavity ,Atomic and Molecular Physics, and Optics ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,Optoelectronics ,0210 nano-technology ,business - Abstract
Resonance interaction between a localized electromagnetic field and excited states in molecules paves the way to control fundamental properties of a matter. In this study, we encapsulated organic molecules with relatively low unoriented dipole moments in the polymer matrix, placed them in tunable optical microcavity and realized, for the first time, controllable modification of the broad photoluminescence (PL) emission of these molecules in strong coupling regime at room temperature. Notably, while in most previous studies it was reported that the single mode dominates in the PL signal (radiation of the so-called branch of the lower polariton), here we report on the observation of two distinct PL peaks, evolution of which has been followed as the microcavity mode is detuned from the excitonic resonance. A significant Rabi splitting estimated from the modified PL spectra was as large as 225 meV. The developed approach can be used both in fundamental research of resonant light-mater coupling and its practical applications in sensing and development of coherent spontaneous emission sources using a combination of carefully designed microcavity with a wide variety of organic molecules., Ministry of Education and Science of the Russian Federation (14.Y26.31.0011); Ministerio de Economiá y Competitividad (FIS2016.80174-P, PLASMOQUANTA).
- Published
- 2019
27. Modification of multiphoton emission properties of single quantum dot due to the long-range coupling with plasmon nanoparticles in thin-film hybrid material
- Author
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Yury P. Rakovich, Victor Krivenkov, Marek Grzelczak, Ana Sánchez-Iglesias, Igor Nabiev, Pavel Samokhvalov, The National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) [Moscow, Russia], CIC BiomaGUNE, CIC BiomaGUNE [Espagne], Donostia International Physics Center (DIPC), University of the Basque Country/Euskal Herriko Unibertsitatea (UPV/EHU), Laboratoire de Recherche en Nanosciences - EA 4682 (LRN), SFR Condorcet, Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Université de Reims Champagne-Ardenne (URCA)-SFR CAP Santé (Champagne-Ardenne Picardie Santé), Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV), Donostia International Physics Center - DIPC (SPAIN), and University of the Basque Country/Euskal Herriko Unibertsitatea (UPV/EHU)-University of the Basque Country/Euskal Herriko Unibertsitatea (UPV/EHU)
- Subjects
Plasmonic nanoparticles ,[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics] ,Materials science ,business.industry ,Nanoparticle ,02 engineering and technology ,[CHIM.MATE]Chemical Sciences/Material chemistry ,Purcell effect ,021001 nanoscience & nanotechnology ,7. Clean energy ,01 natural sciences ,Quantum dot ,0103 physical sciences ,[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] ,Optoelectronics ,Nanorod ,Thin film ,010306 general physics ,0210 nano-technology ,business ,Biexciton ,Plasmon ,ComputingMilieux_MISCELLANEOUS - Abstract
Semiconductor quantum dots (QDs) are known for their unique photophysical properties and, in particular, their ability to multiphoton emission caused by recombination of biexcitons. However, the luminescence quantum yield of biexciton states is relatively low due to the fast Auger non-radiative process. Plasmonic nanoparticles can significantly accelerate the radiative rate of QDs. In this study we demonstrate the distance-controlled enhancement of the biexciton emission of single CdSe/ZnS/CdS/ZnS QDs due to their coupling with gold nanorods. We explain this enhancement as the distancedependent trade-off between the energy transfer and the Purcell effect. Our findings constitute a reliable approach to managing the efficiency of multiphoton emission over a wide span of distances.
- Published
- 2019
28. Photoluminescence Properties of Thin-Film Nanohybrid Material Based on Quantum Dots and Gold Nanorods
- Author
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Victor Krivenkov, Yury P. Rakovich, S. A. Goncharov, Igor Nabiev, Pavel Samokhvalov, The National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) [Moscow, Russia], Laboratoire de Recherche en Nanosciences - EA 4682 (LRN), Université de Reims Champagne-Ardenne (URCA)-SFR CAP Santé (Champagne-Ardenne Picardie Santé), Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-SFR Condorcet, Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS), CSIC-UPV/EHU-MPC and DIPC, Ministry of Education and Science of the Russian Federation, and Ministerio de Economía y Competitividad (España)
- Subjects
Photoluminescence ,Materials science ,business.industry ,Exciton ,Nanoparticle ,02 engineering and technology ,021001 nanoscience & nanotechnology ,7. Clean energy ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,3. Good health ,Quantum dot ,0103 physical sciences ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,Optoelectronics ,Nanorod ,[SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics ,010306 general physics ,0210 nano-technology ,business ,Hybrid material ,Plasmon ,Biexciton - Abstract
Semiconductor quantum dots (QDs) have been demonstrated to be a promising material for developing innovative optoelectronic systems and lasers. The strong and weak coupling effects between localized plasmons in noble metal nanoparticles and excitons in QDs can modulate photoluminescence properties of the latter, scaling up their applications. In particular, these effects can strongly affect the photoluminescence (PL) lifetime of QDs, opening prospects for significantly increasing the quantum yield of the biexciton emission in single QD. Here, we provide а convincing proof of the formation of many-exciton states in hybrid material based on CdSe/ZnS/CdS/ZnS core/multishell QDs and gold nanorods (NRs) embedded in thin films of PMMA. The presence of NRs causes at least an order-of-magnitude decrease in the PL lifetimes of single QD. The obtained results have demonstrated the possibility of detecting biexciton states in QDs as the main component of emission of the hybrid QD-NR material., We acknowledge the support of grant no. 14.Y26.31.0011 of the Ministry of Education and Science of the Russian Federation. Y.R. acknowledges support from project Fis2016.80174-P (PLAS-MOQUANTA) from MINECO (Ministerio de Economiá y Competitividad), Spain.
- Published
- 2018
29. Two-photon photoluminescence of a thin-film hybrid material based on CdSe(core)/ZnS/CdS/ZnS(multishell) semiconductor quantum dots
- Author
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Yury P. Rakovich, Victor Krivenkov, Pavel Samokhvalov, Igor Nabiev, and Daria V. Dyagileva
- Subjects
History ,Photoluminescence ,Materials science ,business.industry ,Computer Science Applications ,Education ,Core (optical fiber) ,Semiconductor quantum dots ,Two-photon excitation microscopy ,Optoelectronics ,Thin film ,Science, technology and society ,business ,Hybrid material - Abstract
Semiconductor quantum dots (QDs) are widely used as components of hybrid materials for development of efficient light emitters and convertors. Their unique nonlinear optical properties, such as two-photon absorption and two-photon photoluminescence from biexcitons, make them promising materials for photovoltaic and optoelectronic applications. In this study, thin-film hybrid materials based on the CdSe(core)/ZnS/CdS/ZnS(multishell) QDs have been fabricated, and the two-photon photoluminescence (PL) from the generated biexcitons have been studied. The results show that fabricated thin-film hybrid materials based on the QDs are efficient fluorophores in the one- and two-photon PL regimes for applications in optoelectronics and biosensing.
- Published
- 2019
30. Numerical modeling of the spectral and spatial distribution of the electromagnetic modes in a tunable microcavity for investigation of the light-matter interaction
- Author
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Dmitriy Dovzhenko, M. A. Lednev, Igor Nabiev, and Yury P. Rakovich
- Subjects
History ,Materials science ,Physics::Optics ,Numerical modeling ,Spatial distribution ,Computer Science Applications ,Education ,Computational physics - Abstract
The light-matter interaction between a molecule and confined electromagnetic field is of great interest because it allows tuning the energy states and the spectral properties of the coupled matter. This effect offers a great number of applications in many areas, such as nonlinear physics, biosensing and lasing. The most widely used approach to achieve light-matter coupling is to place an ensemble of molecules inside an optical cavity. In order to maximize the effects of interaction, it is necessary to model the spectral properties of the cavity in order to find the optimal parameters for the experiments. In this study, the model for the numerical calculation of the spectral and spatial properties of electromagnetic modes of a tunable microcavity was developed and a mode analysis has been performed. The cavity transmission spectra and the electromagnetic field distribution were investigated. The results showed a good agreement with the experimental data obtained earlier.
- Published
- 2019
31. Energy transfer between single semiconductor quantum dots and organic dye molecules
- Author
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Igor Nabiev, Thomas Hendel, Pavel Samokhvalov, Yury P. Rakovich, Pavel Linkov, Dzmitry Melnikau, Ministerio de Economía y Competitividad (España), Ministry of Education and Science of the Russian Federation, CICNanoGUNE, CSIC-UPV/EHU and Donostia International Physics Center (DIPC), The National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) [Moscow, Russia], Laboratoire de Recherche en Nanosciences - EA 4682 (LRN), Université de Reims Champagne-Ardenne (URCA)-SFR CAP Santé (Champagne-Ardenne Picardie Santé), Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-SFR Condorcet, and Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Dye ,Single dot spectroscopy ,Energy transfer ,Physics::Optics ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,7. Clean energy ,semiconductor quantum dots ,Condensed Matter::Materials Science ,Semiconductor quantum dots ,nanocrystals ,Molecule ,Photon antibunching ,Physical and Theoretical Chemistry ,[SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics ,energy transfer ,dye ,021001 nanoscience & nanotechnology ,photon antibunching ,0104 chemical sciences ,Nanocrystals ,Nanocrystal ,Organic dye ,single dot spectroscopy ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,Christian ministry ,Russian federation ,0210 nano-technology - Abstract
An understanding of the mechanisms of energy transfer and conversion on the nanoscale is one of the key requirements for an implementation of highly efficient photonic nanodevices based on hybrid organic/inorganic nanomaterials. In this work we conduct steady-state and time resolved optical studies of the emission properties of an ensembles and single semiconductor quantum dots and attached organic dye molecules. We revealed that the luminescence intensity of a hybrid structure does not follow the blinking behavior of quantum dots. We also demonstrated an efficient single photon generation from single hybrid nanostructures which involves an energy transfer from donor to acceptor as main excitation source., This work was supported by the Ministry of Education and Science of the Russian Federation under grant no. 14.Y26.31.0011. Y. R. and T. H. acknowledges support from Project Fis2016.80174-P (PLASMOQUANTA) from MINECO (Ministerio de Economiá y Competitividad), Spain.
- Published
- 2018
32. Photoluminescent properties of single crystal diamond microneedles
- Author
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Yury P. Rakovich, Pavel V. Fedotov, Rinat R. Ismagilov, K. G. Katamadze, Anna Ermakova, Sergey A. Malykhin, Feruza T. Tuyakova, Petr Siyushev, Alexander N. Obraztsov, Ekaterina A. Obraztsova, Fedor Jelezko, and Russian Government
- Subjects
Photoluminescence ,Materials science ,Material properties of diamond ,02 engineering and technology ,Chemical vapor deposition ,engineering.material ,01 natural sciences ,Inorganic Chemistry ,Silicon-vacancy center ,0103 physical sciences ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry ,010306 general physics ,Radiant intensity ,Spectroscopy ,business.industry ,Organic Chemistry ,Diamond ,021001 nanoscience & nanotechnology ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Crystallography ,engineering ,Optoelectronics ,Crystallite ,0210 nano-technology ,Nitrogen-vacancy center ,business ,Single crystal - Abstract
Single crystal needle-like diamonds shaped as rectangular pyramids were produced by combination of chemical vapor deposition and selective oxidation with dimensions and geometrical characteristics depending on the deposition process parameters. Photoluminescence spectra and their dependencies on wavelength of excitation radiation reveal presence of nitrogen- and silicon-vacancy color centers in the diamond crystallites. Photoluminescence spectra, intensity mapping, and fluorescence lifetime imaging microscopy indicate that silicon-vacancy centers are concentrated at the crystallites apex while nitrogen-vacancy centers are distributed over the whole crystallite. Dependence of the photoluminescence on excitation radiation intensity demonstrates saturation and allows estimation of the color centers density. The combination of structural parameters, geometry and photoluminescent characteristics are prospective for advantageous applications of these diamond crystallites in quantum information processing and optical sensing., Authors are grateful for financial support from Russian Federation President Program for young scientist: Grant# МК-9230.2016.2 (for EAO and FTT) and Grant# MK-5860.2016.2 (for KGK).
- Published
- 2018
33. Photonic molecules and sensors based on coupling between whispering gallery modes in microspheres
- Author
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Vasily N. Astratov, Nicholaos I. Limberopoulos, Farzaneh Abolmaali, Kenneth W. Allen, Alexey V. Maslov, Augustine Urbas, Yury P. Rakovich, and Yangcheng Li
- Subjects
Coupling ,Coupling constant ,Materials science ,business.industry ,Finite-difference time-domain method ,Physics::Optics ,02 engineering and technology ,Dielectric ,021001 nanoscience & nanotechnology ,01 natural sciences ,Spectral line ,010309 optics ,0103 physical sciences ,Optoelectronics ,Classical electromagnetism ,Whispering-gallery wave ,Photonics ,0210 nano-technology ,business - Abstract
Based on analogy between quantum mechanics and the classical electrodynamics, we sorted dielectric microspheres with almost identical positions of their whispering gallery mode (WGM) resonances as photonic atoms. Such microspheres were assembled in a wide range of structures including linear chains and planar photonic molecules. We studied WGM hybridization effects in such structures using side coupling by tapered microfibers as well as finite difference time domain modeling. We demonstrated potential sensing functionality as well as new ways of controlling WGM coupling constants in such molecules. Excellent agreement was found between measured and calculated fiber-transmission spectra for different molecules.
- Published
- 2017
34. Immobilization of pH-sensitive CdTe Quantum Dots in a Poly(acrylate) Hydrogel for Microfluidic Applications
- Author
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Markus Franke, Nikolai Gaponik, Alexander Eychmüller, Susanne Leubner, Athira George, Aliaksei Dubavik, Philipp Frank, Dzmitry Melnikau, Tatiana Savchenko, Cesare Pini, Yury P. Rakovich, Andreas Richter, Russian Government, European Centre for Emerging Materials and Processes Dresden, and European Commission
- Subjects
Photoluminescence ,Materials science ,Poly(acrylate) hydrogel ,Microfluidics ,Nanochemistry ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,chemistry.chemical_compound ,medicine ,lcsh:TA401-492 ,Cadmium telluride ,General Materials Science ,Hybrid material ,Acrylate ,Nano Express ,PH-sensitive polymer ,Quantum dots ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Photoluminescence detection ,Cadmium telluride photovoltaics ,0104 chemical sciences ,chemistry ,Quantum dot ,lcsh:Materials of engineering and construction. Mechanics of materials ,Microfluidic valve ,Swelling ,medicine.symptom ,0210 nano-technology - Abstract
Microfluidic devices present the basis of modern life sciences and chemical information processing. To control the flow and to allow optical readout, a reliable sensor material that can be easily utilized for microfluidic systems is in demand. Here, we present a new optical readout system for pH sensing based on pH sensitive, photoluminescent glutathione capped cadmium telluride quantum dots that are covalently immobilized in a poly(acrylate) hydrogel. For an applicable pH sensing the generated hybrid material is integrated in a microfluidic sensor chip setup. The hybrid material not only allows in situ readout, but also possesses valve properties due to the swelling behavior of the poly(acrylate) hydrogel. In this work, the swelling property of the hybrid material is utilized in a microfluidic valve seat, where a valve opening process is demonstrated by a fluid flow change and in situ monitored by photoluminescence quenching. This discrete photoluminescence detection (ON/OFF) of the fluid flow change (OFF/ON) enables upcoming chemical information processing., MF and SL gratefully acknowledge the cluster of Excellence “Center for Advancing Electronics Dresden (CfAED) for financial and assistant support. AD thanks the Government of the Russian Federation (Grant 074-U01) through ITMO Post-Doctoral Fellowship and the European Social Fund (ESF) for financing within the project “ChemIT”.
- Published
- 2017
35. Versatile H2O2-driven mixed aerogel synthesis from CdTe and bimetallic noble metal nanoparticles
- Author
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Markus Wollgarten, Robert Wendt, Thomas Hendel, Alexander Eychmüller, Anne-Kristin Herrmann, Yury P. Rakovich, Aliaksei Dubavik, B. Märker, Klaus Rademann, and Russian Government
- Subjects
Materials science ,Photoluminescence ,business.industry ,Nanoparticle ,Nanotechnology ,Aerogel ,02 engineering and technology ,General Chemistry ,engineering.material ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Semiconductor ,Transmission electron microscopy ,Materials Chemistry ,engineering ,Noble metal ,0210 nano-technology ,Hybrid material ,business ,Bimetallic strip - Abstract
Mixed aerogels from semiconductor and metal nanoparticles represent an outstanding hybrid material with exceptional properties due to two striking advantages: the creation of a huge quantity of semiconductor-metal interfaces combined with a highly porous three-dimensional nanostructured network. We present a versatile synthetic pathway towards hybrid aerogels built up by joint gelation of CdTe and noble metal nanoparticles (Au, Pd and bimetallic Au/Pd). A straightforward HO treatment inducing gel formation is developed as a more elegant alternative compared to the established photooxidation approach. The use of HO allows a reproducible, simple and mild gel formation which can be easily upscaled. The tremendous influence of the HO concentration on gelation mechanism and gelation kinetics is revealed by photoluminescence quantum yield (PLQY) determinations. Resulting gels are extensively characterized via transmission electron microscopy (TEM), scanning TEM (STEM), energy dispersive X-ray analysis (EDX) as well as photoluminescence (PL) spectroscopy and PL lifetime measurements. By varying the composition of the herein presented noble metal nanoparticles in a controlled fashion the range of semiconductor-metal hybrid aerogels is widened, which demonstrates the versatility and consistency of our approach. This synthetic flexibility grants access to a variety of different mixed hybrid aerogels which are of high significance for catalytic, sensing and photonic applications., Parts of TEM investigations have been carried out at the Leibniz-Institut für Polymerforschung Dresden e.V. Access to their TEM facility is gratefully acknowledged. AD thanks the Government of the Russian Federation (Grant 074-U01) through ITMO Post-Doctoral Fellowship.
- Published
- 2017
36. Linear and nonlinear optics of hybrid plexitonic nanosystems
- Author
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Mikolaj K. Schmidt, Javier Aizpurua, Yury P. Rakovich, Dzmitry Melnikau, Jochen Feldmann, Alexander A. Govyadinov, Alexander S. Urban, Ruben Esteban, Diana Savateeva, Ana Sánchez-Iglesias, Luis M. Liz-Marzán, Thomas Simon, and Marek Grzelczak
- Subjects
Plasmonic nanoparticles ,Materials science ,Photoluminescence ,Condensed Matter::Other ,business.industry ,Magnetic circular dichroism ,Nonlinear optics ,Physics::Optics ,02 engineering and technology ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,021001 nanoscience & nanotechnology ,01 natural sciences ,Molecular physics ,Condensed Matter::Materials Science ,0103 physical sciences ,Ultrafast laser spectroscopy ,Optoelectronics ,010306 general physics ,0210 nano-technology ,business ,Spectroscopy ,Absorption (electromagnetic radiation) ,Plasmon - Abstract
Resumen del trabajo presentado a la 19th International Conference on Transparent Optical Networks (ICTON), celebrada en Girona (España) del 2 al 6 de julio de 2017., We report our recent results of investigation of the interactions between localized plasmons in gold nanorods and excitons in J-aggregates. We were able to track an anticrossing behavior of the hybridized modes both in the extinction and in the photoluminescence spectra of this hybrid system. We identified the nonlinear optical behavior of this system by transient absorption spectroscopy. Finally using magnetic circular dichroism spectroscopy, we show that nonmagnetic organic molecules exhibit magneto-optical response due to binding to a plasmonic nanoparticles. In our experiments, we also studied the effect of detuning as well as the effect of off- and on resonance excitation on the hybrid states.
- Published
- 2017
37. Whispering gallery mode hybridization in photonic molecules
- Author
-
Yangcheng Li, Farzaneh Abolmaali, Nicholaos I. Limberopoulos, Kenneth W. Allen, Augustine Urbas, Alexey V. Maslov, Vasily N. Astratov, Yury P. Rakovich, Air Force Office of Scientific Research (US), National Science Foundation (US), and US Army Research Laboratory
- Subjects
Physics::Optics ,FOS: Physical sciences ,02 engineering and technology ,01 natural sciences ,Microsphere ,010309 optics ,0103 physical sciences ,Center (algebra and category theory) ,Physics - Atomic and Molecular Clusters ,Physics ,Quantum Physics ,business.industry ,Metamaterial ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Engineering physics ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Whispering-gallery wave ,Photonics ,0210 nano-technology ,business ,Atomic and Molecular Clusters (physics.atm-clus) ,Quantum Physics (quant-ph) ,Physics - Optics ,Optics (physics.optics) - Abstract
This work takes inspiration from chemistry where the spectral characteristics of the molecules are determined by hybridization of electronic states evolving from the individual atomic orbitals. Based on analogy between quantum mechanics and the classical electrodynamics, we sorted dielectric microspheres with almost identical positions of their whispering gallery mode (WGM) resonances. Using these microspheres as classical photonic atoms, we assembled them in a wide range of structures including linear chains and planar photonic molecules. We studied WGM hybridization effects in such structures using side coupling by tapered microfibers as well as finite difference time domain modeling. We demonstrated that the patterns of WGM spectral splitting are representative of the symmetry, number of constituting atoms and topology of the photonic molecules which in principle can be viewed as “spectral signatures” of various molecules. We also show new ways of controlling WGM coupling constants in such molecules. Excellent agreement was found between measured transmission spectra and spectral signatures of photonic molecules predicted by simulation., The authors gratefully acknowledge support from U.S. Army Research Office through Dr. J. T. Prater under Contract No. W911NF‐09‐1‐0450 and DURIP W911NF‐11‐1‐0406 and W911NF‐12‐1‐0538. This work was also supported by Center for Metamaterials, an NSF I/U CRC, Award No. 1068050. Also, this work was sponsored by the Air Force Research Laboratory (AFRL/RYD, AFRL/RXC) through the AMMTIAC contract with Alion Science and Technology and the MCF II contract with UES, Inc.
- Published
- 2017
- Full Text
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38. Strong coupling effects in hybrid plexitonic systems
- Author
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Ruben Esteban, Ana Sánchez-Iglesias, Marek Grzelczak, Luis M. Liz-Marzán, Mikolaj K. Schmidt, Dzmitry Melnikau, Alexander A. Govyadinov, Alexander S. Urban, Yury P. Rakovich, Javier Aizpurua, Diana Savateeva, Jochen Feldmann, Thomas Simon, Ministry of Education and Science of the Russian Federation, European Research Council, and Ministerio de Economía y Competitividad (España)
- Subjects
Plasmons ,Photoluminescence ,Materials science ,Exciton ,Physics::Optics ,02 engineering and technology ,01 natural sciences ,Molecular physics ,Magneto-optical effect ,Condensed Matter::Materials Science ,0103 physical sciences ,Ultrafast laser spectroscopy ,010306 general physics ,Spectroscopy ,Plasmon ,Rabi splitting ,Strong coupling ,Plasmonic nanoparticles ,Condensed Matter::Other ,Magnetic circular dichroism ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,021001 nanoscience & nanotechnology ,Nonlinear effects ,Nanorod ,Excitons ,0210 nano-technology ,Plexitons - Abstract
Trabajo presentado a la 3rd International Conference on Applications of Optics and Photonics, celebrado en Faro (Portugal) del 8 al 12 de mayo de 2017., We investigated the interactions between localized plasmons in gold nanorods and excitons in J-aggregates and were able to track an anticrossing behavior of the hybridized modes both in the extinction and in the photoluminescence spectra of this hybrid system. We identified the nonlinear optical behavior of this system by transient absorption spectroscopy. Finally using magnetic circular dichroism spectroscopy we showed that nonmagnetic organic molecules exhibit magneto-optical response due to binding to a plasmonic nanoparticles. In our experiments we also studied the effect of detuning as well as the effect of off- and on resonance excitation on the hybrid states., We acknowledge financial support from Project Fis2016.80174-P (PLASMOQUANTA) from MINECO (Ministerio de Economía y Competitividad). L.L.-M. acknowledges funding from the European Research Council (ERC Advanced Grant 267867, Plasmaquo). This study was supported by the Ministry of Education and Science of the Russian Federation, grant no. 14.Y26.31.0011.
- Published
- 2017
39. Coupled plasmon-exciton hybrid excitations in colloidal gold nanorods coated with J-aggregated dye molecules (Conference Presentation)
- Author
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Marek Grzelczak, Luis M. Liz-Marzán, D. Melnikau, Jochen Feldmann, Thomas Simon, Yury P. Rakovich, Alexander S. Urban, and Ana Sanchez-Iglesia
- Subjects
Materials science ,Absorption spectroscopy ,Exciton ,Physics::Optics ,Nanotechnology ,Molecular physics ,chemistry.chemical_compound ,chemistry ,Colloidal gold ,Ultrafast laser spectroscopy ,Nanorod ,Cyanine ,Spectroscopy ,Plasmon - Abstract
Strong coupling of plasmons and excitons can form hybrid states, the so called “plexcitons”. Especially with molecular J-aggregated dye molecules strong interaction becomes observable even under ambient conditions. In our work we investigate the nature of plexcitonic states formed in gold nanorods coated with a cyanine dye by transient absorption spectroscopy. We demonstrate that plexcitons show tunable plasmonic and excitonic non-linear optical behaviour. Our experimental data can be explained on the basis of a simple Lorentz oscillator model. We find that both the quality factor and the coupling strength between plasmons and excitons can be optically manipulated on an ultrashort time scale. T. Simon, D. Melnikau, A. Sanchez-Iglesias, M. Grzelczak, L. Liz-Marzan, Y. Rakovich, J. Feldmann and A. Urban, Exploring the optical non-linearities of plasmon-exciton hybrid resonances in coupled colloidal nanostructures, submitted (2016)
- Published
- 2016
40. Induced Transparency: Induced Transparency in Plasmon-Exciton Nanostructures for Sensing Applications (Laser Photonics Rev. 13(1)/2019)
- Author
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Victor Krivenkov, Yury P. Rakovich, S. A. Goncharov, and Igor Nabiev
- Subjects
Nanostructure ,Materials science ,Sensing applications ,business.industry ,Exciton ,Condensed Matter Physics ,Laser ,Transparency (behavior) ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,law.invention ,law ,Optoelectronics ,Photonics ,business ,Plasmon - Published
- 2019
41. Induced Transparency in Plasmon-Exciton Nanostructures for Sensing Applications
- Author
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Victor Krivenkov, S. A. Goncharov, Igor Nabiev, Yury P. Rakovich, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), The National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) [Moscow, Russia], Laboratoire de Recherche en Nanosciences - EA 4682 (LRN), Université de Reims Champagne-Ardenne (URCA)-SFR CAP Santé (Champagne-Ardenne Picardie Santé), Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-SFR Condorcet, Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS), and Center of Materials Physics CSIC-UPV / EHU and Donostia International Physics Center
- Subjects
Physics ,excitons ,Sensing applications ,Exciton ,02 engineering and technology ,induced transparency ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Engineering physics ,electromagnetic coupling ,Atomic and Molecular Physics, and Optics ,0104 chemical sciences ,Electronic, Optical and Magnetic Materials ,Transparency (graphic) ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,Electromagnetic coupling ,Christian ministry ,Russian federation ,[SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics ,0210 nano-technology ,plasmons ,sensing ,Plasmon - Abstract
The effect of induced transparency, which is related to photoinduced bleaching of photoabsorbers, is being intensely studied and has many applications in the field of sensing. Along with this classical effect, numerous studies on induced transparency in coupled plasmon–exciton systems, which is accompanied by the formation of hybrid states, have been recently published. The formation of a new coupled system results in various spectral modifications. For example, induced transparency manifests itself as a narrow dip in the absorption spectrum of a coupled system. This effect can be used in sensing, the feasibility of which is the main objective here, where a variety of materials and methods for obtaining the induced transparency are considered. Various morphologies and geometries of plasmonic nanoparticles are discussed as well as types of molecular absorbers to assess the most favorable combinations for the evolvement of induced transparency. The potential applications of the induced transparency effect in sensing and molecular diagnostics are summarized., The Ministry of Education and Science of the Russian Federation, grant no. 14.Y26.31.0011, supported this study. Support from the project Fis2016.80174-P (PLASMOQUANTA) from MINECO (Ministerio de Economiá y Competitividad), Spain, is also acknowledged.
- Published
- 2018
42. Strong coupling detected in the photoluminescence of J-aggregate/plasmon hybrid systems
- Author
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D. Melnikau, Yury P. Rakovich, Mikolaj K. Schmidt, Marek Grzelczak, Ana Sánchez-Iglesias, Diana Savateeva, Luis M. Liz-Marzán, Ruben Esteban, and Javier Aizpurua
- Subjects
0301 basic medicine ,Physics ,Electromagnetics ,Photoluminescence ,business.industry ,Avoided crossing ,01 natural sciences ,Molecular physics ,03 medical and health sciences ,030104 developmental biology ,Extinction (optical mineralogy) ,Hybrid system ,0103 physical sciences ,Optoelectronics ,Molecule ,010306 general physics ,business ,J-aggregate ,Plasmon - Abstract
The interaction between the excitonic J-band of J-aggregate molecules and localized plasmonic resonances supported by metallic structures can be large enough to reach the regime of strong coupling, giving rise to two hybridized modes [1, 2]. The new hybrid system is often characterized in extinction measurements, where the strong coupling results in an avoided crossing of the two modes as the detuning of the plasmonic mode with respect to the excitonic transition is changed. In principle, the photoluminescence (PL) signal should also exhibit a characteristic anti-crossing signature, but, so far, it has been challenging to identify it in experiments [2, 3].
- Published
- 2016
43. Cadmium Telluride Quantum Dots
- Author
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John F. Donegan and Yury P. Rakovich
- Subjects
Materials science ,Quantum dot ,Nanotechnology ,Cadmium telluride photovoltaics - Published
- 2016
44. Assemblies of Thiol-Capped CdTe Nanocrystals
- Author
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Yury P. Rakovich and John F. Donegan
- Subjects
chemistry.chemical_classification ,Materials science ,chemistry ,Cdte nanocrystals ,Thiol ,Photochemistry - Published
- 2016
45. Exploring the optical nonlinearities of plasmon-exciton hybrid resonances in coupled colloidal nanostructures
- Author
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Marek Grzelczak, Dzmitry Melnikau, Alexander S. Urban, Ana Sánchez-Iglesias, Yury P. Rakovich, Luis M. Liz-Marzán, Jochen Feldmann, Thomas Simon, European Commission, European Research Council, Bavarian State Ministry of Education, Science and the Arts, and Ministerio de Economía y Competitividad (España)
- Subjects
Physics ,Exciton ,Strong interaction ,Physics::Optics ,02 engineering and technology ,021001 nanoscience & nanotechnology ,7. Clean energy ,01 natural sciences ,Molecular physics ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Nonlinear system ,General Energy ,Quality (physics) ,Quantum mechanics ,0103 physical sciences ,Ultrafast laser spectroscopy ,Nanorod ,Physical and Theoretical Chemistry ,010306 general physics ,0210 nano-technology ,Spectroscopy ,Plasmon - Abstract
Strong coupling of plasmons and excitons can form hybrid states, the so-called “plexcitons”. Although plasmons have a low quality factor, the exceptionally high coupling strength with molecular aggregates, in particular J-aggregates, allows the realization of strong interaction. Despite several studies in recent years showing the formation of plexcitonic states, their nature, especially at very short times, is still insufficiently investigated. In this article, we identify the nonlinear optical behavior of plexcitons formed on gold nanorods coated with J-aggregated cyanine molecules at short times by transient absorption spectroscopy and a simple Lorentz oscillator model. We control the spectral overlap of the two resonances and analyze the effect of detuning as well as the effect of off- and on resonance excitation on the hybrid states. We demonstrate that at ultrashort time scales plexcitons show tunable plasmonic and excitonic nonlinear performance according to the hybridization model. In a first approach, we discover a way to optically manipulate the quality factor and study the effects on the coupled hybrid states. As a second approach, we find that the coupling strength can also be influenced on an ultrashort time scale in the strong coupling regime when plexcitons are excited., This work has been financially supported by the ERC Advanced Grant HYMEM and the Bavarian State Ministry of Science, Research, and Arts through “Solar Technologies Go Hybrid” (SolTech) as well as through Projects FIS2013-41184-P and MAT2013-46101-R of the Spanish Ministry of Economy and Competitiveness (MINECO).
- Published
- 2016
46. Rabi splitting in photoluminescence spectra of hybrid systems of gold nanorods and J-aggregates
- Author
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Javier Aizpurua, Marek Grzelczak, Mikolaj K. Schmidt, Diana Savateeva, Ruben Esteban, Yury P. Rakovich, Dzmitry Melnikau, Ana Sánchez-Iglesias, Luis M. Liz-Marzán, Ministerio de Economía y Competitividad (España), Diputación Foral de Guipúzcoa, and European Commission
- Subjects
Photoluminescence ,Luminescence ,Exciton ,Physics::Optics ,Nanotechnology ,02 engineering and technology ,01 natural sciences ,Molecular physics ,Spectral line ,0103 physical sciences ,Polariton ,General Materials Science ,Physical and Theoretical Chemistry ,010306 general physics ,Plasmon ,Fluorescent Dyes ,Nanotubes ,Chemistry ,Spectrum Analysis ,Resonance ,Carbocyanines ,Models, Theoretical ,021001 nanoscience & nanotechnology ,Extinction (optical mineralogy) ,Nanorod ,Benzimidazoles ,Gold ,0210 nano-technology - Abstract
We experimentally and theoretically investigate the interactions between localized plasmons in gold nanorods and excitons in J-aggregates under ambient conditions. Thanks to our sample preparation procedure we are able to track a clear anticrossing behavior of the hybridized modes not only in the extinction but also in the photoluminescence (PL) spectra of this hybrid system. Notably, while previous studies often found the PL signal to be dominated by a single mode (emission from so-called lower polariton branch), here we follow the evolution of the two PL peaks as the plasmon energy is detuned from the excitonic resonance. Both the extinction and PL results are in good agreement with the theoretical predictions obtained for a model that assumes two interacting modes with a ratio between the coupling strength and the plasmonic losses close to 0.4, indicative of the strong coupling regime with a significant Rabi splitting estimated to be ∼200 meV. The evolution of the PL line shape as the plasmon is detuned depends on the illumination wavelength, which we attribute to an incoherent excitation given by decay processes in either the metallic rods or the J-aggregates., We acknowledge financial support from Projects FIS2013-41184-P and MAT2013-46101-R of the Spanish Ministry of Economy and Competitiveness (MINECO) and ETORTEK project NANOGUNE’14. R.E. acknowledges funding as Fellow Gipuzkoa of the Gipuzkoako Foru Aldundia through Feder Funds of the European Union “Una manera de hacer Europa”.
- Published
- 2016
47. Chiroptical activity in colloidal quantum dots coated with achiral ligands
- Author
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Diana Savateeva, Alexander O. Govorov, Yury P. Rakovich, Nikolai Gaponik, Dzmitry Melnikau, and Ministerio de Economía y Competitividad (España)
- Subjects
Circular dichroism ,Materials science ,business.industry ,Nanoparticle ,Nanotechnology ,02 engineering and technology ,Crystal structure ,Dichroism ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,0104 chemical sciences ,Nanomaterials ,Crystallography ,Optics ,Nanocrystal ,Quantum dot ,Monolayer ,0210 nano-technology ,business - Abstract
We studied the chiroptical properties of colloidal solution of CdSe and CdSe/ZnS quantum dots (QDs) with a cubic lattice structure which were initially prepared without use of any chiral molecules and coated with achiral ligands. We demonstrate circular dichroism (CD) activity around first and second excitonic transition of these CdSe based nanocrystals. We consider that this chiroptical activity is caused by imbalance in racemic mixtures of QDs between the left and right handed nanoparticles, which appears as a result of the formation of various defects or incorporation of impurities into crystallographic structure during their synthesis. We demonstrate that optical activity of colloidal solution of CdSe QDs with achiral ligands weakly depends on the QDs size and number of ZnS monolayers, but does not depend on the nature of achiral ligands or polarity of the solution., Project FIS2013-41184-P of the Spanish Minsitry of Economy and Competitiveness MINECO.
- Published
- 2016
- Full Text
- View/download PDF
48. Energy Transfer in Hybrid Organic/Inorganic Semiconductor Nanostructures
- Author
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Diana Savateeva, Dzmitry Melnikau, and Yury P. Rakovich
- Subjects
Materials science ,Energy transfer ,Organic inorganic ,Semiconductor nanostructures ,Nanotechnology ,Electrical and Electronic Engineering ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,Electronic, Optical and Magnetic Materials - Abstract
We report on direct formation of J-aggregates in cyanine dye solution by injection of colloidal CdTe quantum dots. The optical properties of formed J-aggregates have been investigated by absorption and photoluminescence spectroscopy and fluorescence lifetime imaging microscopy. Quantum dots/J-aggregate system shows the enhanced absorption in visible and ultraviolet parts of the spectrum typical of quantum dots, along with the narrow emission linewidth and fast recombination rate characteristic of the J-band emitters. Our studies suggest electrostatic association between the J-aggregates and quantum dots, followed by highly efficient energy transfer. Copyright © 2012 American Scientific Publishers All rights reserved.
- Published
- 2012
49. Photosensitizer Methylene Blue-Semiconductor Nanocrystals Hybrid System for Photodynamic Therapy
- Author
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Vincent P. Kelly, Yury P. Rakovich, Alexander Eychmüller, John F. Donegan, Aliaksandra Rakovich, Vladimir Lesnyak, and Tatsiana Rakovich
- Subjects
Carcinoma, Hepatocellular ,Materials science ,Absorption spectroscopy ,Macromolecular Substances ,medicine.medical_treatment ,Molecular Conformation ,Biomedical Engineering ,Bioengineering ,Photodynamic therapy ,Photochemistry ,chemistry.chemical_compound ,Cell Line, Tumor ,Materials Testing ,Quantum Dots ,Cadmium Compounds ,medicine ,Humans ,General Materials Science ,Photosensitizer ,Particle Size ,Methylene ,Spectroscopy ,Photosensitizing Agents ,Singlet oxygen ,General Chemistry ,Condensed Matter Physics ,Nanostructures ,Methylene Blue ,Nanomedicine ,Photochemotherapy ,Semiconductors ,chemistry ,Tellurium ,Crystallization ,Hybrid material ,Methylene blue ,HeLa Cells - Abstract
Physikalische Chemie/Elektrochemie, TU Dresden, Bergstr. 66b, 01062 Dresden, GermanyIn this work we report on the development of novel hybrid material with enhanced photodynamicproperties based on methylene blue and CdTe nanocrystals. Absorption spectroscopy, visible photo-luminescence spectroscopy and uorescence lifetime imaging of this system reveal efcient chargetransfer between nanocrystals and the methylene blue dye. Near infra-red photoluminescencemeasurements provide evidence for an increased efciency of singlet oxygen production by themethylene blue dye. In vitro studies on the growth of HepG2 and HeLa cancerous cells were alsoperformed, they point towards an improvement in the cell kill efciency for the methylene blue-semiconductor nanocrystals hybrid system.
- Published
- 2010
50. Mode manipulation in system of coupled microcavities with whispering gallery modes
- Author
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K. I. Rusakov, M. Gerlach, John F. Donegan, A. A. Gladyshchuk, and Yury P. Rakovich
- Subjects
Length scale ,Physics ,Photon ,business.industry ,Physics::Optics ,Laser ,Atomic and Molecular Physics, and Optics ,Symmetry (physics) ,Electronic, Optical and Magnetic Materials ,law.invention ,Micrometre ,Optics ,Atomic orbital ,law ,Optoelectronics ,Physics::Chemical Physics ,Photonics ,Whispering-gallery wave ,business - Abstract
In recent years the studies of electromagnetic modes in solid spherical microcavities have been of great interest both for their potential applications and fundamental optical properties. A system of coherently coupled microcavities may be called a “photonic molecule” and can be employed in the tight-binding device in order to manipulate photons in micrometer length scale. In this work we demonstrate the possibility of mode manipulation in systems of symmetric photonic molecules formed by placing several high-Q micro-spheres in contact. We observe photonic nanojets that reflect the symmetry of the photonic molecule, with 3 jets located at 120 degrees with respect to each other for the triangular photonic molecule. A benzene molecule-like structure consisting of a 7-microspheres cyclic photonic molecule shows a field emission pattern similar to the spatial distribution of the orbitals of the benzene molecule. We also present some results showing the coexistence of whispering gallery modes and photonic nanojets in the same structure.
- Published
- 2010
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