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16 results on '"Institute for Electronic Structure and Laser (IESL)"'

2. Cross-Section Doping Topography of 4H-SiC VJFETs by Various Techniques

Author

Konstantinos Vamvoukakis, Marianthi Panagopoulou, Maher Nafouti, George Konstantinidis, Antonis Stavrinidis, Daniel Alquier, Konstantinos Zekentes, Maria Kayambaki, Nikolaos Makris, Katerina Tsagaraki, Hervé Peyre, Institute for Electronic Structure and Laser (IESL), Foundation for Research and Technology - Hellas (FORTH), GREMAN (matériaux, microélectronique, acoustique et nanotechnologies) (GREMAN - UMR 7347), Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Tours (UT)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Tours-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, 02 engineering and technology, TSI-VJFET, Epitaxy, 01 natural sciences, Cross section (physics), chemistry.chemical_compound, 0103 physical sciences, Silicon carbide, General Materials Science, SSRM, 010302 applied physics, Silicon Carbide, business.industry, Mechanical Engineering, Doping, 021001 nanoscience & nanotechnology, Condensed Matter Physics, [SPI.TRON]Engineering Sciences [physics]/Electronics, SCM, chemistry, Mechanics of Materials, SEM, Optoelectronics, Field-effect transistor, 0210 nano-technology, business, SIMS
Abstract

International audience; Different methods for cross-section doping topography of SiC Trenched-singly-implanted vertical junction field effect transistors (TSI-VJFETs) are presented with the purpose to determine the doping distribution in the epitaxial structure and the implanted areas.

Published
2018
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3. Technology and performance of SiC- based Nanowire Field Effect Transistors (NWFETs)

Author

Zekentes, Konstantinos, Bano, Edwige, Zekentes, Konstantinos, Institut de Microélectronique, Electromagnétisme et Photonique - Laboratoire d'Hyperfréquences et Caractérisation (IMEP-LAHC ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institute for Electronic Structure and Laser (IESL), and Foundation for Research and Technology - Hellas (FORTH)

Subjects
[SPI.NANO] Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, ComputingMilieux_MISCELLANEOUS, [SPI.TRON] Engineering Sciences [physics]/Electronics, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract

International audience

Published
2017

4. 3D plasmonic crystal metamaterials for ultra-sensitive biosensing

Author

Andrei V. Kabashin, Artem Danilov, Maria Manousidaki, Konstantina Terzaki, Maria Farsari, Andrey Aristov, Costas Fotakis, Institute for Electronic Structure and Laser (IESL), Foundation for Research and Technology - Hellas (FORTH), Laboratoire Lasers, Plasmas et Procédés photoniques (LP3), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)

Subjects
Multidisciplinary, Materials science, business.industry, Physics::Optics, Metamaterial, Biosensing Techniques, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Article, Crystal, Delocalized electron, Spectral sensitivity, 0103 physical sciences, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Physics::Atomic and Molecular Clusters, Optoelectronics, 010306 general physics, 0210 nano-technology, business, Biosensor, Refractive index, Plasmon, Localized surface plasmon
Abstract

We explore the excitation of plasmons in 3D plasmon crystal metamaterials and report the observation of a delocalized plasmon mode, which provides extremely high spectral sensitivity (>2600 nm per refractive index unit (RIU) change), outperforming all plasmonic counterparts excited in 2D nanoscale geometries, as well as a prominent phase-sensitive response (>3*104 deg. of phase per RIU). Combined with a large surface for bioimmobilization provided by the 3D matrix, the proposed sensor architecture promises a new important landmark in the advancement of plasmonic biosensing technology.

Published
2016
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5. Analysis of the environmental magnetic noise rejection by using two simple magnetoelectric sensors

Author

Jiefang Li, Liangguo Shen, Ying Shen, Junqi Gao, David Gray, Sébastien Saez, Dwight D. Viehland, Christophe Dolabdjian, Xin Zhuang, Peter Finkel, Department of Materials Science and Engineering [Blacksburg] (MSE), Virginia Tech [Blacksburg], Institute for Electronic Structure and Laser (IESL), Foundation for Research and Technology - Hellas (FORTH), Naval Undersea Warfare Center, Naval Research Laboratory (NRL), Equipe Electronique - Laboratoire GREYC - UMR6072, Groupe de Recherche en Informatique, Image et Instrumentation de Caen (GREYC), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU), and Zhunag, Xin

Subjects
Engineering, Magnetic noise, Acoustics, 02 engineering and technology, 01 natural sciences, Simple (abstract algebra), Data logger, 0103 physical sciences, Image noise, Electrical and Electronic Engineering, Instrumentation, 010302 applied physics, Signal processing, Magnetoelectric senssors, business.industry, Metals and Alloys, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Noise floor, [SPI.TRON] Engineering Sciences [physics]/Electronics, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, [SPI.TRON]Engineering Sciences [physics]/Electronics, Noise, Electromagnetic shielding, 0210 nano-technology, business
Abstract

International audience; We have evaluated the performance of a classical differential technique to reject magnetic or, in a lesser extent, the vibrational coherent noise sources sensed by two identical magnetoelectric (ME) laminated sensors with the help of a data logger. The signals of two ME sensors were directly subtracted given highly homogeneous external noise. Through a signal processing technique, the intrinsic noise of the ME sensor systems was obtained to be 20 pT/√Hz with a rejection factor of the external homogeneous noise sources of 20. The latter is mainly limited, as theoretical described, by the incoherent noise and discrepancy between the sensors. To demonstrate the efficiency of this technique by using ME sensors, internal noise tests were also performed in a magnetic shielding chamber for individual ME sensor and shown to be close to that of the sensors in an open environment

Published
2011

6. Tuning spectral properties of ultrafast laser ablation plasmas from brass using adaptive temporal pulse shaping

Author

David Gray, Mathieu Guillermin, Razvan Stoian, A. Klini, Jean-Philippe Colombier, Eric Audouard, Florence Garrelie, Carl Liebig, Costas Fotakis, Laboratoire Hubert Curien [Saint Etienne] (LHC), Institut d'Optique Graduate School (IOGS)-Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS), Institute for Electronic Structure and Laser (IESL), Foundation for Research and Technology - Hellas (FORTH), ULTRA, European Project: 212025,EC:FP7:INFRA,FP7-INFRASTRUCTURES-2007-1,LASERLAB-EUROPE CONT(2008), Laboratoire Hubert Curien (LHC), and Institut d'Optique Graduate School (IOGS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Femtosecond pulse shaping, Materials science, Hot Temperature, Manufactured Materials, plume optimization, 02 engineering and technology, Radiation Dosage, 01 natural sciences, law.invention, Pulsed laser deposition, X-ray laser, Optics, law, 0103 physical sciences, Ultrafast laser spectroscopy, Materials Testing, pulsed laser deposition, 010302 applied physics, Laser ablation, temporal pulse shaping, business.industry, Lasers, 021001 nanoscience & nanotechnology, Laser, Pulse shaping, Atomic and Molecular Physics, and Optics, breakdown spectroscopy, Zinc, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Gases, (140.3390) Laser materials processing, (320.2250) Femtosecond phenomena, ultrafast laser ablation, 0210 nano-technology, business, Ultrashort pulse, Copper
Abstract

International audience; Using automated laser pulse temporal shaping we report on enhancing spectral emission characteristics of ablation plasmas produced by laser irradiation of brass on ultrafast time scales. For different input irradiance levels, control of both atomic and ionic species becomes possible concerning the yield and the excitation state. The improved energy coupling determined by tailored pulses induces material ejection with lower mechanical load that translates into hot gas-phase regions with higher excitation degrees and reduced particulates.

Published
2010

7. Schottky barrier 3C-SiC nanowire field effect transistor ECSCRM

Author

Rogdakis, K., Bano, Edwige, Montes, L., Bechelany, Mikhael, Cornu, D., Zekentes, K., Institut de Microélectronique, Electromagnétisme et Photonique - Laboratoire d'Hyperfréquences et Caractérisation (IMEP-LAHC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences de la Terre de Paris (iSTeP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Institut Européen des membranes (IEM), Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire des Matériaux Inorganiques (LMI), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Clermont Université-SIGMA Clermont (SIGMA Clermont)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology - Hellas (FORTH), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National Polytechnique de Grenoble (INPG)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), and Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2010

8. Electrical transport properties of catalyst-free grown 3C-SiC nanowires

Author

Rogdakis, K., Bano, Edwige, Montes, L., Zekentes, K., Bechelany, Mikhael, Cornu, D., Institut de Microélectronique, Electromagnétisme et Photonique - Laboratoire d'Hyperfréquences et Caractérisation (IMEP-LAHC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National Polytechnique de Grenoble (INPG)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences de la Terre de Paris (iSTeP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology - Hellas (FORTH), Institut Européen des membranes (IEM), Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire des Matériaux Inorganiques (LMI), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Clermont Université-SIGMA Clermont (SIGMA Clermont)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS), and Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, ComputingMilieux_MISCELLANEOUS
Abstract

National audience

Published
2009

9. Theoretical comparison of 3C-SiC and Si nanowire FETs in ballistic and diffusive regimes

Author

Konstantinos Zekentes, Marc Bescond, Edwige Bano, K. Rogdakis, Institut de Microélectronique, Electromagnétisme et Photonique - Laboratoire d'Hyperfréquences et Caractérisation (IMEP-LAHC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National Polytechnique de Grenoble (INPG)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Institute of Electronic Structure and Laser (IESL), and Foundation for Research and Technology - Hellas (FORTH)

Subjects
Materials science, Nanowire, Bioengineering, Nanotechnology, 02 engineering and technology, 01 natural sciences, Ion, chemistry.chemical_compound, Condensed Matter::Materials Science, 0103 physical sciences, Silicon carbide, General Materials Science, Electrical and Electronic Engineering, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, Quantum, 010302 applied physics, business.industry, Mechanical Engineering, Wide-bandgap semiconductor, General Chemistry, 021001 nanoscience & nanotechnology, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Subthreshold slope, chemistry, Mechanics of Materials, Optoelectronics, Field-effect transistor, Poisson's equation, 0210 nano-technology, business
Abstract

International audience; Silicon carbide (SiC) nanowires (NWs) could combine the properties of one-dimensional (1D) structures with those of a wide band gap semiconductor. For this reason, we solved self-consistently the Poisson equation with both the quantum Non-Equilibrium Green Function Formalism (NEGF) and the classical drift–diffusion model in order to model and compare 3C-SiC and Si NW Field Effect Transistors (FETs) operating in ballistic and diffusive regimes. As a general conclusion from our calculations in the ballistic regime, Si and SiC NW FETs have almost the same electrical behavior. They show the same subthreshold slope and have similar on-current (ION/IOFF (SiC) ~81% ION/IOFF (Si) in the case of a 4 nm NW cross-section side). The drift–diffusion model predicts a better performance for SiC NW FETs. More specifically, SiC devices have a lower subthreshold slope (~85% for a Si device with 200 nm channel length) than Si devices as the FET channel length increases (from 200 to 750 nm), and as in case of ballistic regime SiC devices have a slightly smaller on-current.

Published
2007
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10. Temporal pulse manipulation and consequences for ultrafast laser processing of materials

Author

Maria Spyridaki, Sebastian W. Winkler, Arkadi Rosenfeld, Costas Fotakis, Panos Tzanetakis, Nadezhda M. Bulgakova, Igor M. Burakov, Ingolf V. Hertel, Alexandre Mermillod-Blondin, Emmanuel Koudoumas, Razvan Stoian, Laboratoire Hubert Curien [Saint Etienne] (LHC), Institut d'Optique Graduate School (IOGS)-Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS), Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie (MBI), Forschungsverbund Berlin e.V. (FVB) (FVB)-Leibniz Gemeinschaft, University of Georgia [USA], Institute for Electronic Structure and Laser (IESL), Foundation for Research and Technology - Hellas (FORTH), Institute of Thermophysics (ITP), and Siberian Branch of the Russian Academy of Sciences (SB RAS)

Subjects
Materials science, Adaptive optimization, Nanotechnology, 02 engineering and technology, 01 natural sciences, Semiconductor laser theory, law.invention, adaptive optimization, Quality (physics), law, 0103 physical sciences, 010306 general physics, business.industry, General Engineering, 021001 nanoscience & nanotechnology, Laser, Pulse shaping, Atomic and Molecular Physics, and Optics, Modulation, 42.65.Re, 61.82.Fk, 42.60.Fc, 61.80.Ba, 78.47.+p, 64.70.Hz, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Optoelectronics, ultrafast laser ablation, 0210 nano-technology, business, Ultrashort pulse, Excitation, pulse shaping, material processing
Abstract

Invited paper for the Topical Issue J. Opt. Eng. (modeling and applications of laser ablation and micromachining in optics) Opt. Eng. 44. 051106 (2005); International audience; Abstract. Following advances in ultrafast laser technology as a reliable tool for material probing and processing, we discuss various options for control and optimization. The possibility to tailor the temporal shape of ultrashort laser pulses enables extended opportunities for material processing. The concept of optimizing laser interactions is based on the possibility to regulate the energy delivery so that control of laser-induced phenomena can be achieved and quality structures can be realized. An experimental demonstration of the possibility to design excitation sequences tailored with respect to the material response is described, laying the groundwork for adaptive optimization in materials structuring. We show that under particular irradiation conditions involving modulated excitation, the energy flow can be controlled and the material response can be guided to improve processing results. This is particularly important for processing brittle materials. Further examples are given to illuminate the possibility to optimize the kinetic properties of ions emitted from laserirradiated semiconductors, using excitation sequences synchronized with the solid-to-liquid transformation time. Versatile sub-kilo-electronvolt ion beams are obtained, exploiting transitions to supercritical fluid states with minimal energetic expenses. Temporally selective irradiation can thus open up efficient thermodynamic paths, unfolding interesting perspectives for ‘‘intelligent,'' feedback-assisted processing of materials.

Published
2005
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11. Adaptive control of ion beams produced by ultrafast laser ablation of silicon

Author

Stoian, Razvan, Mermillod-Blondin, Alexandre, M. Bulgakova, Nadezhda, Rosenfeld, Arkadi, Spyridaki, Maria, Koudoumas, Emmanuel, Fotakis, Costas, V. Hertel, Ingolf, Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie (MBI), Forschungsverbund Berlin e.V. (FVB) (FVB)-Leibniz Gemeinschaft, Laboratoire Hubert Curien [Saint Etienne] (LHC), Institut d'Optique Graduate School (IOGS)-Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS), Institute of Thermophysics (ITP), Siberian Branch of the Russian Academy of Sciences (SB RAS), Institute for Electronic Structure and Laser (IESL), and Foundation for Research and Technology - Hellas (FORTH)

Subjects
adaptive optimization, temporal pulse shaping, ion generation, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, femtosecond ablation, material processing
Abstract

In a context where ultrafast lasers have become ideal tools for material probing and processing we present various concepts for process control and optimization. Temporal tailoring of ultrashort laser pulses enables synergies between radiation and material and, therefore, new opportunities for optimal processing of materials. The concept of optimizing laser interactions is based on the possibility to adjust energy delivery so that control of laser-induced processes can be achieved and particular states of matter can be accessed. We present recent results related to the implementation of adaptive feedback loops based on temporal shaping of ultrafast laser pulses to control laser-induced phenomena for practical applications. The chosen example indicates the possibility to manipulate the kinetic properties of ions emitted from ultrafast laser irradiated semiconducting samples, using excitation sequences synchronized with the phasetransformation characteristic times. Versatile sub-keV ion beams are obtained exploiting transitions to supercritical fluid states with minimal energetic expenses, while achieving very efficient energy coupling and thermodynamic paths towards highly volatile states. Temporally selective irradiation can thus open up efficient thermodynamic paths towards critical points, delivering at the same time an extended degree of control in material processing.

Published
2005

12. Using lasers for cleaning ceramic and plaster patrimonial objects

Author

Eric Tanguy, Nathalie Huet, Vassilis Zafiropulos, Armand Vincotte, Arc'Antique, Arc'antique, Laboratoire de Physique des Isolant et d'Optronique (LPIO), Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS), Institute of Electronic Structure and Laser (IESL), and Foundation for Research and Technology - Hellas (FORTH)

Subjects
Materials science, [SHS.ARCHEO]Humanities and Social Sciences/Archaeology and Prehistory, Metallurgy, chemistry.chemical_element, Dirt, Laser, Neodymium, law.invention, [SPI.TRON]Engineering Sciences [physics]/Electronics, chemistry, law, visual_art, visual_art.visual_art_medium, Energy density, Forensic engineering, Ceramic, Third harmonic
Abstract

International audience; Traditional cleaning techniques (sandblasting, chemical, ...) turn out to be ineffective or damaging on some ceramics and plaster objects. It's especially true on outdoor ceramics covered with black crust or indoor biscuits wares and plasters exposed to dust and repeated handling. The use of lasers to remove dirt, such as for stone, has then been considered. This paper study the behavior of these materials under the impact of different type of lasers irradiation (Nd:YAG first and third harmonic, excimer,...). According to the type of dirt and underlying material, the effectiveness of cleaning depends on the laser wavelength and its energy density. The results are satisfactory with no damage and no coloration change on plaster cleaning by Nd:YAG third harmonic

Published
2003
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13. Laser cleaning of tarnished silver and copper threads in museum textiles

Author

Vassilis Zafiropulos, Giorgios Marakis, Eric Tanguy, Christian Degrigny, René Le Gall, Arc Antique, Arc'Antique Nantes, Laboratoire de Physique des Isolant et d'Optronique (LPIO), Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS), Institut des Matériaux Jean Rouxel (IMN), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN), Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology - Hellas (FORTH), Ecole Polytechnique de l'Université de Nantes (EPUN), and Université de Nantes (UN)-Université de Nantes (UN)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST)

Subjects
Archeology, Materials science, [SHS.ARCHEO]Humanities and Social Sciences/Archaeology and Prehistory, Infrared, Materials Science (miscellaneous), 010401 analytical chemistry, Metallurgy, chemistry.chemical_element, 02 engineering and technology, Conservation, 021001 nanoscience & nanotechnology, Laser, 01 natural sciences, Copper, 0104 chemical sciences, law.invention, [SPI.TRON]Engineering Sciences [physics]/Electronics, chemistry, Chemistry (miscellaneous), law, 0210 nano-technology, General Economics, Econometrics and Finance, Ultraviolet radiation, Spectroscopy
Abstract

International audience; Recent developments in laser techniques in the conservation field have allowed us to test the laser cleaning of tarnished silver and copper threads in textiles. The experimental samples were copper and silver plates that had been artificially sulphurised as well as silk bands dyed according to traditional procedures. The experiments were carried out with different Nd3+:YAG lasers emitting infrared, visible and ultraviolet radiation. The work has focused on optimising the cleaning process to control the side effects (whitening or yellowing of silver and reddening of copper) produced. Tests were also conducted on real artefacts, and the results are discussed.

Published
2003

14. Optimization of ultrafast laser generated low-energy ion beams from silicon targets

Author

Emmanuel Koudoumas, Alexandre Mermillod-Blondin, P. Tzanetakis, Maria Spyridaki, Nadezhda M. Bulgakova, Ingolf V. Hertel, Costas Fotakis, Razvan Stoian, Arkadi Rosenfeld, Laboratoire Hubert Curien [Saint Etienne] (LHC), Institut d'Optique Graduate School (IOGS)-Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS), Institute of Thermophysics (ITP), Siberian Branch of the Russian Academy of Sciences (SB RAS), Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie (MBI), Forschungsverbund Berlin e.V. (FVB) (FVB)-Leibniz Gemeinschaft, Institute for Electronic Structure and Laser (IESL), and Foundation for Research and Technology - Hellas (FORTH)

Subjects
Materials science, Physics and Astronomy (miscellaneous), Silicon, Physics::Optics, chemistry.chemical_element, 02 engineering and technology, Kinetic energy, 7. Clean energy, 01 natural sciences, Ion, law.invention, Optics, law, high-speed optical techniques, 0103 physical sciences, 010306 general physics, Laser ablation, optical pulse shaping, vaporisation, business.industry, ion beams, silicon, 021001 nanoscience & nanotechnology, Laser, Semiconductor, chemistry, 42.65.Re, 61.82.Fk, 42.60.Fc, 61.80.Ba, 78.47.+p, 64.70.Hz, laser ablation, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, elemental semiconductors, 0210 nano-technology, business, Ultrashort pulse, laser tuning, Excitation
Abstract

International audience; We demonstrate the possibility to manipulate the kinetic properties of ion beams generated by ultrafast laser ablation of silicon. The versatility in regulating the sub-keV ion flux is achieved by implementing adaptive control of the temporal shape of incident laser pulses. Tunable characteristics for the charged beams are obtained using excitation synchronized with the phase-transformation dynamics, exploiting transitions to volatile fluid states with minimal energetic expenses.

Published
2005
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15. Mise en forme temporelle d'impulsions laser femtosecondes pour l'étude des processus d'ablation et l'optimisation des procédés

Author

Matthieu Guillermin, Jean-Philippe Colombier, Florence GARRELIE, Eric Audouard, Razvan Stoian, Klini, A., Gray, D., Fotakis, C., Laboratoire Hubert Curien [Saint Etienne] (LHC), Institut d'Optique Graduate School (IOGS)-Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS), Institute for Electronic Structure and Laser (IESL), and Foundation for Research and Technology - Hellas (FORTH)

Subjects
[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic

16. Osteogenic Potential of Nano-Hydroxyapatite and Strontium-Substituted Nano-Hydroxyapatite.

Author

Kontogianni GI, Coelho C, Gauthier R, Fiorilli S, Quadros P, Vitale-Brovarone C, and Chatzinikolaidou M

Abstract

Nanohydroxyapatite (nanoHA) is the major mineral component of bone. It is highly biocompatible, osteoconductive, and forms strong bonds with native bone, making it an excellent material for bone regeneration. However, enhanced mechanical properties and biological activity for nanoHA can be achieved through enrichment with strontium ions. Here, nanoHA and nanoHA with a substitution degree of 50 and 100% of calcium with strontium ions (Sr-nanoHA_50 and Sr-nanoHA_100, respectively) were produced via wet chemical precipitation using calcium, strontium, and phosphorous salts as starting materials. The materials were evaluated for their cytotoxicity and osteogenic potential in direct contact with MC3T3-E1 pre-osteoblastic cells. All three nanoHA-based materials were cytocompatible, featured needle-shaped nanocrystals, and had enhanced osteogenic activity in vitro. The Sr-nanoHA_100 indicated a significant increase in the alkaline phosphatase activity at day 14 compared to the control. All three compositions revealed significantly higher calcium and collagen production up to 21 days in culture compared to the control. Gene expression analysis exhibited, for all three nanoHA compositions, a significant upregulation of osteonectin and osteocalcin on day 14 and of osteopontin on day 7 compared to the control. The highest osteocalcin levels were found for both Sr-substituted compounds on day 14. These results demonstrate the great osteoinductive potential of the produced compounds, which can be exploited to treat bone disease.

Published
2023
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