A5075940943- Nanowire Synthesis and Applications
- Silicon Nanostructures and Photoluminescence
- Plasmonic and Surface Plasmon Research
- Photonic and Optical Devices
- Thermal Radiation and Cooling Technologies
- Thin-Film Transistor Technologies
- Metamaterials and Metasurfaces Applications
- Near-Field Optical Microscopy
- Textile materials and evaluations
- Material Dynamics and Properties
- Advancements in Semiconductor Devices and Circuit Design
- Metallic Glasses and Amorphous Alloys
- Advanced Sensor and Energy Harvesting Materials
- Composite Material Mechanics
- Advanced Thermodynamics and Statistical Mechanics
- 3D Shape Modeling and Analysis
- Glass properties and applications
- Optical properties and cooling technologies in crystalline materials
- Advanced Fluorescence Microscopy Techniques
- Photochemistry and Electron Transfer Studies
- Photonic Crystals and Applications
- Urban Heat Island Mitigation
- Semiconductor Quantum Structures and Devices
- Electron and X-Ray Spectroscopy Techniques
- High-pressure geophysics and materials
Institut Pprime
2017-2022
Institut Langevin
2019-2022
Institut Jean Nicod
2019-2022
Centre National de la Recherche Scientifique
2012-2019
Université de Poitiers
2017-2019
École Nationale Supérieure de Mécanique et d'Aérotechnique
2017-2019
Université de Toulouse
2012-2018
Centre d’Élaboration de Matériaux et d’Études Structurales
2012-2018
Université Toulouse III - Paul Sabatier
2012-2015
University of Sfax
2012-2013
The link between the energy surface of bulk systems and their dynamical properties is generally difficult to establish. Using activation-relaxation technique, we follow change in barrier distribution a model amorphous silicon as function degree global relaxation. We find that while barrier-height distribution, calculated from initial minimum, unique depends only on level relaxation, reverse-barrier height final state, independent following different function. Moreover, resulting gained or...
We report about the experimental observation and characterization of nonlinear optical properties individual silicon nanowires different dimensions. Our results show that light has components, one them corresponding to second harmonic generation (SHG). The SHG strongly depends on polarization excitation nanowire diameter, gives access local electromagnetic field intensity distribution. Furthermore, we harmonic, when observed, is enhanced compared bulk sensitive resonances supported by...
We propose a novel procedure to design three-dimensional (3D) printable cross-linked random fiber networks. Our describes how implement, in way, modified version of random-walk based algorithm using combination different free and open-source software programs. Second, we describe detail method on an finite-element software, analyse the steady-state heat conduction compute effective thermal conductivity for fibrous structures immersed vacuum. apply this examine orientations fibers volume...
Semiconducting nanowires (NWs) are good candidates for new optoelectronic or photovoltaic devices due to their excellent ability guide, scatter, absorb light, from near ultraviolet infrared. The existence of morphology-dependent optical resonances opens a promising route overcome the intrinsic limitations constituent material and optimize interaction with light. We propose thorough investigation properties Si${}_{1\ensuremath{-}x}$Ge${}_{x}$ alloy addressing influence NW diameter,...
Semiconductor nanowires have an excellent ability to trap, guide, scatter, or absorb light for specific morphology-dependent resonant optical modes. The electromagnetic field enhancement associated with these modes could be used modify the luminescence of emitters positioned in vicinity nanowire, a way similar plasmonic nanostructures. We show that photoluminescence single plane silicon nanocrystals silica, at about 3 nm below surface, can enhanced by factor 2 presence nanowire antenna on...
Coaxial core-sheath semiconductor nanowires exhibit an improved light absorption efficiency, rendering them promising building blocks in photovoltaic devices. In the present theoretical work, we focus on optical properties of Si/Ge and Ge/Si nanowires, compared to Si1−xGex alloy variants (without coated shell) same composition Si Ge. Using analytical Lorenz-Mie theory, compute both scattering efficiencies, with a particular attention devoted shell thickness influence. The leaky modes...
Controlling the temperature in architectures involving nanoparticles and substrates is a key issue for applications micro nanoscale heat transfer. We study thermal behavior of single nanoparticle interacting with flat substrate under external monochromatic illumination, radiation as unique loss channel. develop model to compute nanoparticle, based on an effective dipole-polarizability approach. Using numerical simulations, we thoroughly investigate impacts various parameters affecting...
We present a simple and inexpensive means to measure background-free photoinduced absorption spectra by implementing dual optical modulation scheme. Our objective is quasi-steady-state of long-lived photoexcitations, such as polarons triplet excitons in organic semiconductors, when the photoluminescence sample strong compared signal. In our instrument, we modulate continuous-wave laser at frequency $f_{pu}$ with mechanical chopper before exciting material. fractional change transmission...
Semiconductor nanowires have an excellent ability to trap, guide, scatter or absorb light thanks the presence of specific resonant optical modes. The electromagnetic field-enhancement associated such effects can be used modify luminescence emitters positioned in vicinity nanowire, as plasmonic nano-antennas. We show that photoluminescence silicon nanocrystals embedded silica enhanced by a factor about 3 nanowire on surface. This could basis promising CMOS-compatible process improve...
Semiconductor nanowires (NW) are good candidates for new optoelectronic or photovoltaic devices due to their exceptional ability guide, scatter absorb light, from near-ultraviolet near-infrared. The occurrence of morphology-dependent optical resonances in opens a route overcome the intrinsic limitations some materials (for instance limited absorption silicon visible spectrum its indirect band gap) and optimize interaction with light. Most applications were recently focused on devices,...
High refractive index dielectric nanostructures provide original optical properties thanks to the occurrence of size- and shape-dependent resonance modes. These modes commonly present a spectral overlap broad, low-order (\textit{e.g}. dipolar modes) much narrower, higher-order The latter are usually characterized by rapidly varying frequency-dependent phase, which - in superposition with lower order mode approximately constant phase leads typical features known as Fano resonances....
We propose a modulation method to record background-free far field FTIR spectra of single sub $-\lambda$ sized objects which we combine with near-field TRSTM measurements characterize the thermal emission plasmonic antennas and silica rods. The fundamental mode MIM nanoantennas is excited at multiple wavelengths. © 2019 Author(s)
We propose a modulation method to record background-free far field FTIR spectra of single sub-λ sized objects which we combine with near-field TRSTM measurements characterize the thermal emission plasmonic antennas and silica rods. The fundamental mode MIM nanoantennas is excited at multiple wavelengths.
We propose a novel procedure to design three-dimensional ( 3D ) printable cross-linked random fiber networks. Our describes how implement, in way, modified version of random-walk based algorithm using combination different free and open-source softwares . Second, we describe detail method on an finite-element software, analyse the steady-state heat conduction compute effective thermal conductivity for fibrous structures immersed vacuum. apply this examine orientations fibers volume fraction...