A5104077532- Laser Material Processing Techniques
- Semiconductor materials and devices
- Ocular and Laser Science Research
- Photorefractive and Nonlinear Optics
- Laser-induced spectroscopy and plasma
- Surface Roughness and Optical Measurements
- Solid State Laser Technologies
- Advanced Surface Polishing Techniques
- Electronic and Structural Properties of Oxides
- Photonic and Optical Devices
- Linguistics and Discourse Analysis
- Metal and Thin Film Mechanics
- Diamond and Carbon-based Materials Research
- Optical Coatings and Gratings
- Ferroelectric and Piezoelectric Materials
- Glass properties and applications
- Ferroelectric and Negative Capacitance Devices
- Cultural Insights and Digital Impacts
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Laser Technologies
- Photonic Crystals and Applications
- Nonlinear Optical Materials Studies
- Catalytic Processes in Materials Science
- Historical and Literary Analyses
- ZnO doping and properties
Institut Fresnel
2012-2024
German Meteorological Service
2018-2023
Aix-Marseille Université
2011-2022
Centre National de la Recherche Scientifique
2011-2022
Centrale Marseille
2009-2022
Université Rennes 2
2013-2022
Centre d'Etudes en Civilisations, Langues et Littératures Etrangères
2022
Université Gustave Eiffel
2011-2021
Karlsruhe Institute of Technology
2018-2021
Lawrence Livermore National Laboratory
2019
Superhydrophobicity is obtained on photolithographically structured silicon surfaces consisting of flat-top pillars after a perfluorosilanization treatment. Systematic static contact angle measurements were carried out these as function pillar parameters that geometrically determine the surface roughness, including height, diameter, top perimeter, overall filling factor, and disposition. In line with thermodynamics models, two regimes angles are observed varying each parameter independently:...
In this research, we highlight an innovative combinatorial approach to explore the correlation between elemental composition of SrTiO 3 thin films and their photoelectrochemical characteristics for water splitting.
The surface of monocrystalline silicon was chemically converted with hydrocarbon to polycrystalline β-silicon carbide, and the growth mechanism investigated by means 14C tracer method. It is shown that carbide layer due diffusion through SiC so Si–SiC conversion taking place at sample. Dependence thickness on carbidizing time concentration in carrier gas hydrogen measured.
We present an innovative dielectric layer composed of a ternary oxide composite, including high-k materials Al2O3, ZrO2, and HfO2. These composite films were deposited using the Chemical Beam Vapor Deposition (CBVD) technique with combinatorial approach. investigated their structural, nanostructural, morphological, electrical properties for three different Al:Zr:Hf atomic concentrations (∼27:61:12), (∼44:42:13), (∼67:20:12), which are normalized as AZH (2.2:5:1), (3.3:3.2:1), (5.5:1.6:1),...
Magnetic frustration effects in artificial kagome arrays of nanomagnets with out-of-plane magnetization are investigated using magnetic force microscopy and Monte Carlo simulations. Experimental theoretical results compared to those found for the spin ice which have in-plane magnetization. In contrast what has been recently reported, we demonstrate that long-range (i.e., beyond nearest-neighbor) dipolar interactions between cannot be neglected when describing configurations observed after...
Abstract Lithium niobate is a material of special interest for its challenging functional properties, which can suit various applications. However, high quality 200‐mm Li x Nb 1‐x O 3 thin film grown on sapphire substrate have never been reported so far limits these potential This paper reports the efficient optimization LiNbO deposition (001) through chemical beam vapor in combinatorial configuration. With this technique, flow ratio Li/Nb be tuned from ≈0.25 to ≈2.45 single wafer. Various...
The application of variable angle spectroscopic ellipsometry (VASE) to the characterization thin films is very important because it facilitates understanding their physical and optical properties. To prepare a series film samples consisting TiO 2 :ZrO on TiN/Si substrate, we employed SYBILLA P200 equipment (manufactured by ABCD Technology) through process Chemical Beam Vapor Deposition (CBVD). composite material that has gained significant attention in various technological applications,...
The electroosmotic flow in laminated excimer laser-ablated microchannels has been studied as a function of the depth rectangular channels, and particular emphasis given to difference zeta-potentials between lamination layer ablated substrate. Experimental follows tendency predicted by recently published model. surfaces were determined for poly(ethylene terephthalate) poly(carbonate) substrates fitting experimental data with numerical implementation this In experimentally investigated range...
Bulk laser-induced damage at 1064 nm has been investigated in KTiOPO4 (KTP) and RbTiOPO4 (RTP) crystals with a nanosecond pulsed Nd:YAG laser. Both belong to the same family. Throughout this study, their comparison shows very similar laser-damage behavior. The evolution of resistance under high number shots per site (10,000 shots) reveals fatigue effect KTP RTP crystals. In addition, S-on-1 probability curves have measured both for all combinations polarization propagation direction aligned...
Multiple pulse nanosecond laser induced damage in the bulk of LiB3O5 (LBO) crystals was investigated at 1064 nm, 532 nm and 355 nm. Scanning electron microscopy cleaved sites confirmed presence different zones that have already been reported case KH2PO4 (KDP). Multi measurements reveal a strong decrease threshold with increasing number (fatigue effect). A weaker fatigue effect observed no found This observation is best explained by an inherently statistical light matter interaction...
We have used time-resolved x-ray photoemission electron microscopy to investigate the magnetization dynamics induced by nanosecond current pulses in NiFe/Cu/Co nanostripes. A large tilt of NiFe direction transverse stripe is observed during pulses. show that this effect cannot be quantitatively understood from amplitude Oersted field and shape anisotropy. High-frequency oscillations at onset are attributed precessional motion about effective field. discuss possible origins potential...
Multiple-pulse S-on-1 laser damage experiments were carried out in the bulk of synthetic fused silica at 355 nm and 266 nm. Two beam sizes used for each wavelength pulse duration was 8 ns. The results showed a fatigue effect that is due to cumulative material modifications. modifications have long lifetime dynamics are independent but differ two wavelengths. Based on fact that, context material-modification induced damage, thresholds smaller beams higher than larger beams, we discuss...
The coupling of a laser focused into water microjet is studied. Using high-power laser, the light guided in jet used to process various materials. To explain observed ablation patterns, propagation low-power and highly coherent beam coupled laminar He-Ne (5 mW) jet, which behaves as multimode waveguide. distribution intensity impinging on glass plate cutting perpendicularly its direction recorded for conditions. influence diameter, well depth focus incident position with respect center A...
Nanosecond-laser induced damage of RbTiOPO(4) crystals (RTP) has been studied at 1064 nm as a function propagation direction and polarization orientation. A significant difference in the Laser Induced Damage Threshold (LIDT) was observed for x-cut y-cut Pockels cell configuration, where light is along x y axes crystal respectively. In configuration oriented 45? with respect to z-axis crystal. Experiments parallel principal pointed out importance LIDT whereas did not significantly influence...
This work is dedicated to the study of so-called fatigue effects upon nanosecond laser-induced damage several crystalline materials and synthetic fused silica irradiated by multiple pulses. The obtained probability versus fluence pulse number data are exploited determine if observed due statistics (the more often material irradiated, higher for it be damaged) or modification under irradiation. Whereas 1064 nm irradiation seems responsible statistic behavior, 355 generates modifications in...
Unexpectedly high efficiency stimulated Raman scattering are seen in micrometer-sized water jets. The pumping laser beam of a 100-W frequency-doubled Nd:YAG is coupled into the jet similar to an optical fiber.The light guided within jet, providing irradiance level throughout its stable portion (typically 60 80 mm case μm diameter). This results long interaction length between intensity and water. At levels, one order magnitude smaller than breakdown threshold 26.7% was converted Stokes...
Multipulse laser-induced damage is an important topic for many applications of nonlinear crystals. We studied multipulse in X-cut KTiOPO4. Using a 6-ns Nd:YAG laser with weakly focused beam, fatigue phenomenon was observed. addressed whether this necessarily implies material modifications. Two possible models were tested, both them predicting increasing probability pulse number while all properties are kept constant. The first model, energy fluctuations and depointing, increases the probed...
We describe the design of thin, ~ 100-180 micron diameter, optical silica fibers for illumination. The fiber has a core with specially engineered scattering centers to scatter light through walls across wide wavelength range.
An innovative deposition system has been developed to construct complex material thin films from single-element precursors by chemical beam vapor (CBVD). It relies on well distributed punctual sources that emit individually controlled precursor beams toward the substrate under high vacuum conditions combined with designed cryo-panel surfaces avoid secondary sources. In this configuration impinging flows of all can be calculated at any point considering angular distribution emitted and...