A5029786643- Photorefractive and Nonlinear Optics
- Photonic and Optical Devices
- Nonlinear Optical Materials Research
- Liquid Crystal Research Advancements
- Advanced Fiber Laser Technologies
- Nonlinear Optical Materials Studies
- Laser Material Processing Techniques
- Photochemistry and Electron Transfer Studies
- Advanced Fiber Optic Sensors
- Semiconductor Lasers and Optical Devices
- Organic Electronics and Photovoltaics
- Photonic Crystals and Applications
- Organic Light-Emitting Diodes Research
- Luminescence and Fluorescent Materials
- Solid State Laser Technologies
- Photopolymerization techniques and applications
- Advanced Fluorescence Microscopy Techniques
- Photochromic and Fluorescence Chemistry
- Glass properties and applications
- Spectroscopy and Quantum Chemical Studies
- Porphyrin and Phthalocyanine Chemistry
- Optical and Acousto-Optic Technologies
- Synthesis and properties of polymers
- Force Microscopy Techniques and Applications
- Plasmonic and Surface Plasmon Research
Université de Strasbourg
2012-2025
Institut de Physique et Chimie des Matériaux de Strasbourg
2014-2025
Centre National de la Recherche Scientifique
2012-2025
International Council on Mining and Metals
2016
Laboratoire d'Optique Appliquée
1998-2012
Alabama Agricultural and Mechanical University
2001
Institut d’Optique Graduate School
1995
Laboratoire Charles Fabry
1994
We report a novel approach to modify the second order nonlinear optical (NLO) susceptibility of organic nanofiber crystals by hybridization with modes microcavities in strong coupling regime. The wavelength dependence SHG efficiency displays two intense peaks corresponding so-formed light-matter hybrid states. Our results demonstrate an enhancement resonant lower polariton 2 orders magnitude for collectively coupled molecules as compared that same material outside microcavity. This study is...
We investigated the condition of unique self-written channel and multichannel propagation inside bulk photopolymerizable materials. Light was introduced in medium by a single-mode optical fiber. At very low beam power 5 muW , uniform-channel waveguide without any broadening obtained polymerization. When input is increased to 100 guide becomes chaotic multichannel. connected two fibers separated 1-cm distance. The results open door studies electro-optical properties photopolymerized guides...
We investigate the charge transport, photophysical and amplified spontaneous emission properties of a series monodisperse solution-processable oligofluorenes functionalized with hexyl chains at C9 position each fluorene unit.
We propose to encode optical information through the localized depoling of polar chromophores in thin films grafted polymeric materials with a femtosecond near IR laser source. This disorientation is promoted photoisomerization azo-dye component induced by twophoton absorption process. show that resulting loss second harmonic generation efficiency can be exploited data storage applications. The low irradiation powers used allow for recycling reheating and repoling leading rewritable system.
Abstract The nonlinear properties and the photophysical behavior of two π‐conjugated chromophores that incorporate an electron‐deficient pyrimidine core (A) γ‐methylenepyrans as terminal donor (D) groups have been thoroughly investigated. Both dipolar quadrupolar branching strategies are explored rationalized on basis Frenkel exciton model. Even though a cooperative effect is clearly observed if dimensionality increased, optical (NLO) response this series moderate one considers nature D/A...
Ambipolar charge transport and low threshold amplified spontaneous emission are observed in novel highly fluorescent liquid fluorene derivatives.
The photophysical properties of novel donor–acceptor dyad and triad molecules show an intricate interplay between energy electron transfer processes.
We report herein the synthesis, functionalization, and successful radical polymerization of very nonlinear optical (NLO) active push–pull polyene chromophores (CPO). Second, thermal Huisgen cyclo-addition cross-linking reaction was implemented, it proved to be fully compatible with a polyene-based chromophore. Toward this goal, PMMA-co-CPO-3 two cross-linkable polymers (PCC1-CPO-3 PCC2-CPO-3) were first prepared characterized by modified Teng Man technique performed in transmission. These...
New hybrid organic/inorganic magnets have been synthesized by insertion of stilbazolium-carboxylate and/or -sulfonate dyes into cobalt and copper layered hydroxides. Co2(OH)3.57(MR)0.43·1.88 H2O (MR⊂Co (1)) (MRNa: Methyl Red sodium salt: 2-[4-(Dimethylamino)phenylazo]benzoate), Co2(OH)3.27(MO)0.73·2.94 (MO⊂Co (2)) (MONa: Orange 4-[4-(Dimethylamino)phenylazo]benzenesulfonate), Co2(OH)3.45(OrangeIV)0.55·2.92 (OrangeIV⊂Co (3)) (OrangeIVNa: OrangeIV 4-[4-(Anilino)phenylazo]benzenesulfonate),...
Abstract The development of high‐efficiency near‐infrared (NIR) emitters for organic light‐emitting diodes (OLEDs) and semiconductor lasers has become an important target in photonics. Herein, it is demonstrated that donor‐acceptor‐donor borondifluoride curcuminoid derivatives represent a versatile simple platform the molecular engineering NIR combining thermally‐activated delayed fluorescence (TADF) with excellent electroluminescence properties amplified spontaneous emission (ASE) activity....
Defect engineering and structure‐property relationship understanding in methylammonium lead iodide (MAPI) hybrid perovskites (HPs) attract significant scientific interest, as synthesis‐related defects may strongly influence intrinsic properties. We have explored a green solvent‐free synthesis—mechanosynthesis—leading to large quantities of MAPI powder with tuneable defect density suitable study an electromagnetic wave absorbing (EMWA) material. A dielectric loss enhancement was revealed at...
Two new asymmetrically substituted BTBT mesogens were successfully synthesised. These designed to achieve low melting and clearing temperatures via the decoration with swallow-tailed chains containing peripheral siloxane units....
We report on the photorefractive properties of a low Tg composite consisting functionalized polysiloxane doped with chalcone derivative. The high transparency this doping molecule enabled observation net gain at 514 nm. Orientational and Pockels contributions to total refractive index variations were measured by frequency-dependent ellipsometry experiments. Finally, field dependence coefficient is described using Kukhtarev’s model for space charge an effective trap density as single fitting...
We have performed multi-photon image reconstructions as well polarization state analyses inside an artery wall affected by atherosclerosis to investigate the changes in collagen structure. Mice, either healthy or spontaneous atherosclerosis, been used for this purpose. A two-photon imaging system has atherosclerotic lesions ascending aorta of mice. Second harmonic alternatively on samples and region. The reconstructed images show that spatial distribution network seems disorganized disease....
Abstract Sixteen model (donor–π–) 2 acceptor–π–donor [(D–π–) A–π–D] molecules with an extraordinary T‐shaped arrangement were designed and synthesized. Indan‐1,3‐dione was employed as a central acceptor electron donors linked at the C‐2, C‐4, C‐7 positions. These push–pull represent first systematic modification of indan‐1,3‐dione‐fused benzene ring. The structures properties all target investigated by X‐ray analysis, electrochemistry, UV/Vis absorption spectroscopy, differential scanning...
Dynamics of the photo-induced charge transfer are correlated with structural properties self-assembled discotic donor–acceptor dyad and triad films.
We present experimental and theoretical study of the interaction Light Induced Self-Written (LISW) waveguides in photopolymers. show that diffusion monomer controls refractive index distribution. Consequently it influences between LISW channels allowing observation anti-crossing behavior or propagation an array non interacting waveguides.
The temperature dependence of the electro-optic responses in a low glass transition (Tg) photorefractive polymer was investigated using an ellipsometric technique. sample composed carbazole functionalized polysiloxane doped with push–pull chalcone derivative. results provide information on orientational dynamics chromophores doping host. For this purpose, response is directly compared, for different temperatures above Tg, to dynamic shear compliance measurements characterizing mechanical...
We report on the demonstration of liquid organic dye lasers based 9-(2-ethylhexyl)carbazole (EHCz), so-called carbazole, doped with green- and red-emitting laser dyes. Both waveguide Fabry-Perot type microcavity fluidic were prepared by capillary action under solvent-free conditions. Cascade Förster-type energy transfer processes from carbazole to dyes employed achieve color-variable amplified spontaneous emission lasing. Overall, this study provides first step towards development...
We show that through the introduction of short dimethylsiloxane chains, it was possible to suppress crystalline state CBP in favor various types organization, transitioning from a soft crystal fluid liquid mesophase, then state. Characterized by X-ray scattering, all organizations reveal similar layered configuration which layers edge-on lying cores alternate with siloxane. The difference between essentially lay on regularity molecular packing modulates interactions neighboring conjugated...
Biexcitons in CuCl microcrystallites are investigated by recording their luminescence under high-laser-excitation conditions. The study of the line shape emission band attributed to biexciton-exciton transitions indicates an increase biexciton binding energy when microcrystallite radius is decreased. In addition, distribution established shown be independent laser-excitation conditions, such as laser intensity and frequency.
Abstract A series of [1]benzothieno[3,2-b][1]benzothiophene-2,7-dicarboxylate derivatives consisting a flat, conjugated aromatic moiety containing sulphur hetero-atoms and substituted by terminal chains - ethyl, decyl, Z-4-decenyl or 2-(2-butoxyethoxy)ethyl has been synthesized. These materials exhibit smectic liquid crystalline phase, the stability which was found to be strongly dependent on length nature chains. In mesophase, molecular arrangement within layer is characterized local...
While information encoding through optically induced orientation of azo dyes in organic matrices is being extensively pursued, we propose the alternative starting out with poled films and to locally reduce their second-harmonic generation capacity by a focused near-infrared femtosecond laser beam moderate intensity. Arrays dots irradiated under varying conditions are subsequently imaged situ as dark spots on bright background. The samples also examined conventional optical microscopy atomic...
We present the fabrication of single mode light induced self-written waveguides using two-photon absorption in photopolymers. The measurements are compared to finite element method simulation propagation and demonstrate that process leads confinement light.