A5027513910- Glass properties and applications
- Luminescence Properties of Advanced Materials
- Photonic Crystals and Applications
- Radiation Detection and Scintillator Technologies
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Laser-Ablation Synthesis of Nanoparticles
- Mesoporous Materials and Catalysis
- Photonic and Optical Devices
- Photonic Crystal and Fiber Optics
- Advanced Radiotherapy Techniques
- Pigment Synthesis and Properties
- Photorefractive and Nonlinear Optics
- Nonlinear Optical Materials Studies
- Gas Sensing Nanomaterials and Sensors
- Aerogels and thermal insulation
- Silicon Nanostructures and Photoluminescence
- Solid State Laser Technologies
- Advanced Fiber Optic Sensors
- Gold and Silver Nanoparticles Synthesis and Applications
- Catalytic Processes in Materials Science
- Advanced Fiber Laser Technologies
- Advanced Optical Sensing Technologies
- Quantum and electron transport phenomena
- TiO2 Photocatalysis and Solar Cells
Laboratoire de Physique des Lasers, Atomes et Molécules
2016-2025
Université de Lille
2010-2025
Centre National de la Recherche Scientifique
2016-2025
Institut de Recherche sur les Composants logiciels et matériels pour l'Information et la Communication Avancée
2011-2023
Laboratoire de physique des lasers
2015
Laboratoire de Spectroscopie pour les Interactions, la Réactivité et l'Environnement
1998-2010
École Nationale Supérieure de Chimie de Lille
2010
Nello Carrara Institute of Applied Physics
2010
Université Côte d'Azur
2010
Istituto di Fotonica e Nanotecnologie
2010
We report the fabrication and characterization of a photonic crystal fiber (PCF) having sol-gel core doped with ionic copper. Optical measurements demonstrate that copper is preserved in silica glass all along preparation steps up to drawing. The photoluminescence results clearly show such an copper-doped constitutes potential candidate for UV-C (200-280 nm) radiation dosimetry. Indeed, Cu⁺-related visible shows linear response 244 nm light excitation measured irradiation power 2.7 mW at...
Nanocomposites have been processed following a wet-impregnation approach, by confined growth of nanoparticles the spin crossover complex [Fe(Htrz)2(trz)](BF4) within pre-formed transparent mesoporous silica monoliths well controlled porosity. The obtained materials were studied using numerous characterisation techniques to define interplay between porosity host matrix, structure and morphology in situ elaborated nanoparticles, properties composite. Transmission electron micrographs show...
We report on the optical spectroscopy of monolithic fiber preform prepared from nanoporous bismuth-doped silica glass. The experiments reveal existence at least two different types active centers and clearly demonstrate that presence in glass matrix other dopant is not necessary to obtain near-IR photoluminescence connected Bismuth.
We report on the sol-gel fabrication and characterization of (100−x)SiO2–xSnO2 (x=8, 16, 25mol%) glass-ceramic waveguides doped with 1mol% Eu3+. A suitable top-down thermal process led to formation SnO2 nanocrystals ∼4nm embedding Eu3+ ions. The excitation spectra evidence role interband electronic transition luminescence Monitoring D05→F27 emission, we observe about 15 times increase in intensity absorption band, moving from x=8to25mol%. These also exhibit low losses, making them quite...
Solid-core photonic crystal fibers with the core derived from nondoped or Erbium-doped sol-gel silica rods are fabricated.The results demonstrate that direct polymeric route constitutes a promising method to prepare large high quality glass pieces can be integrated into microstructured optical suitable for passive and active fiber applications.
Er 3+ doped aluminosilicate thin films were prepared on silica and Si substrates by the sol-gel method. The ion concentration was varied from 0.25% to 1%. Fluorescences of ions in visible infrared regions characterized. Green red up-conversion fluorescences centered at 548 655 nm for, respectively, (2H11/2+4S3/2)→4I15/2 2F9/2→4I15/2 observed. A broadband peak observed 1531 corresponding 4I13/2 → 4I15/2 transition, with full width half-maximum 47 comparable those other methods. fluorescence...
Transmission spectra of gases confined (but not adsorbed) within the pores a 1.4-cm-thick silica xerogel sample have been recorded between 2.5 and 5 \ensuremath{\mu}m using high-resolution Fourier transform spectrometer. This was done for pure CO, CO${}_{2}$, N${}_{2}$O, H${}_{2}$O, CH${}_{4}$ at room temperature pressures few hectopascals. Least-squares fits measured absorption lines provide optical-path lengths (${L}^{C}$) free (${L}^{F}$) gas inside cell half width maximum...
Abstract Optical fibers hold promise for accurate dosimetry in small field proton therapy due to their superior spatial resolution and the lack of significant Cerenkov contamination beams. One known drawback most scintillation detectors is signal quenching areas high linear energy transfer, as case Bragg peak region a beam. In this study, we investigated potential innovative optical fiber bulk materials using sol-gel technique therapy. This type glass made amorphous silica (SiO $${}_{2}$$...
Cerium-doped silica glass has been prepared for ionizing radiation dosimetry applications, using the sol–gel route and densification under different atmospheres. In comparison with densified air atmosphere, one obtained after sintering xerogel helium gas presents improved optical properties, an enhancement of photoluminescence quantum yield up to 33%, which is attributed a higher Ce3+ ions concentration. Such glassy rod jacketed in quartz tube then drawn at high temperature cane, used as...
We investigate the potential of innovative optical fiber bulk materials made by sol-gel technique for realtime proton beam monitoring. Those types glass are amorphous silica (a-SiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ) doped with either Copper (Cu) or Cerium (Ce) ions. These optimized possess very interesting light emission properties when exposed to protons. For both glasses, online monitoring strong radiationinduced...
We report on the production of air/silica photonic crystal fiber doped with gold nanoparticles. The stack-and-draw technique was used to combine a nanoparticles-doped silica core rod synthesized by sol-gel route capillaries drawn from commercially available tubes. presence nanoparticles in region confirmed at different steps process down geometry, even after multiple drawings ~2000 °C. Optical properties were investigated and put evidence impact both linear nonlinear transmission.
The infrared absorption in the fundamental band of CO gas confined porous silica xerogel has been recorded at room temperature for pressures between about 5 and 920 hPa using a high resolution Fourier transform spectrometer. widths individual lines are determined from fits measured spectra compared with ab initio predictions obtained requantized classical molecular dynamics simulations. Good agreement is low pressure regime where line shapes governed by molecule-wall collisions to influence...
We report on the fabrication of Eu3+-doped SiO2−SnO2 low-loss (0.8 dB/cm at 632.8 nm) glass-ceramic planar waveguides, fabricated by sol−gel technique and dip-coating processing. The effects heat treatments growth evolution SnO2 nanocrystals in matrix were investigated using different spectroscopic tools. In situ high-temperature X-ray diffraction allowed for determination crystallization temperature confirmed formation tetragonal rutile crystals. effect optical properties photoluminescence...