A5072048982- Photorefractive and Nonlinear Optics
- Nonlinear Optical Materials Studies
- Nonlinear Optical Materials Research
- Photonic and Optical Devices
- Solid-state spectroscopy and crystallography
- Spectroscopy Techniques in Biomedical and Chemical Research
- Crystal Structures and Properties
- Ferroelectric and Piezoelectric Materials
- Quantum Dots Synthesis And Properties
- Iron oxide chemistry and applications
- Magneto-Optical Properties and Applications
- Surfactants and Colloidal Systems
- Mechatronics Education and Applications
- Spectroscopy and Quantum Chemical Studies
- Multiferroics and related materials
- Analytical Chemistry and Sensors
- Biomedical and Engineering Education
- Luminescence Properties of Advanced Materials
- Advanced Fiber Laser Technologies
- Nanoparticle-Based Drug Delivery
- Protein Interaction Studies and Fluorescence Analysis
- Semiconductor Lasers and Optical Devices
- E-Learning and Knowledge Management
- Photonic Crystals and Applications
- Magnetic Properties and Synthesis of Ferrites
Université Savoie Mont Blanc
2011-2023
Laboratoire de Mécanique des Sols, Structures et Matériaux
2006-2019
Université de Lorraine
2010
Centre National de la Recherche Scientifique
2010
Institut Jean Lamour
2010
University of Lomé
2010
Laboratoire d'Annecy-le-Vieux de Physique Théorique
1995-2007
Nonlinear optical nanocrystals have been recently introduced as a promising alternative to fluorescent probes for multiphoton microscopy. We present the first time complete survey of properties five nanomaterials (KNbO(3), LiNbO(3), BaTiO(3), KTP, and ZnO), describing their preparation stabilization providing quantitative estimations nonlinear response. In light prospective use biological clinical markers, we assess biocompatibility on human healthy cancerous cell lines. Finally, demonstrate...
Harmonic Nanoparticles are a new family of exogenous markers for multiphoton imaging exerting optical contrast by second harmonic (SH) generation. In this tutorial, we present the application Hyper-Rayleigh Scattering (HRS) quantitative assessment nonlinear properties these particles and discuss underlying theory some crucial experimental aspects. The BaTiO3, KNbO3, KiTiOPO4 (KTP), LiNbO3 ZnO nanocrystals (NCs) investigated HRS measurements after careful preparation characterization...
Hyper Rayleigh scattering (HRS) and second harmonic (SH) microscopy were used to study the order nonlinear optical response of ZnO BaTiO3 nanocrystals, which have been recently proposed as new markers for bioimaging. HRS, combined with dynamic light scattering, was first retrieve hyperpolarizabilities coefficients both type nanocrystals. The results indicate that main contribution SH signal is related bulk noncentrosymmetric structure particles. Successively, we carried out inspection...
Second Harmonic Generation (SHG) from BiFeO3 nanocrystals is investigated for the first time to determine their potential as biomarkers multiphoton imaging. Nanocrystals are produced by an auto-combustion method with 2-amino-2-hydroxymethyl-propane-1,3-diol a fuel. Stable colloidal suspensions mean particle diameters in range 100–120 nm then obtained after wet-milling and sonication steps. SHG properties determined using two complementary experimental techniques, Hyper Rayleigh Scattering...
We present a technique to characterize ultrashort pulses at the focal plane of high numerical aperture objective with unprecedented spatial resolution, by performing FROG measurement single nanocrystal as nonlinear medium.This approach can be extended develop novel phase-sensitive techniques in laser scanning microscopy, probing microscopic environment monitoring phase and amplitude distortions femtosecond pulses.
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Abstract We present two new synthetic routes for bismuth ferrite harmonic nanoparticles (BiFeO 3 HNPs). Both phase-pure and mixed phase BiFeO materials were produced after improvement of the solvent evaporation sol-gel combustion routes. Metal nitrates with a series dicarboxylic acids (tartronic, tartaric mucic) used to promote crystallization. found that longer carbon backbone hydroxyl group attached each carbon, lower annealing temperature. also demonstrate nanocrystals more readily formed...
Synthesis and characterization of anhydrous LiZn(IO3)3 powders prepared from an aqueous solution are reported. Morphological compositional analyses were carried out by using scanning electron microscopy energy-dispersive X-ray measurements. The synthesized exhibited a needle-like morphology after annealing at 400 °C. A crystal structure for the compound was proposed powder diffraction density-functional theory calculations. Rietveld refinements led to monoclinic structure, which can be...
Phase-pure, highly crystalline sub-50 nm LiNbO3 nanocrystals were prepared from a non-aqueous solvothermal process for 72 h at 230 °C and commercial precursor solution of mixed lithium niobium ethoxide in its parent alcohol. A systematic variation the reaction medium composition with addition different amounts co-solvent including butanol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol resulted formation adjustable mean size shape anisotropy, as demonstrated XRD measurements TEM imaging....
A detailed experimental investigation of the formation mechanisms acentric iron iodate [Fe(IO3)3] nanocrystals in AOT-based reverse micelles according to water-in-oil (w/o) microemulsion (ME) composition and temperature was performed. low chemical reaction rate first demonstrated by means UV−vis absorption spectroscopy. Attainment crystalline nanorods then attributed an oriented aggregation mechanism 10−20-nm amorphous primary nanoparticles. As for intermicellar exchange reactants, also...
The present paper proposes an optical device for measuring low-frequency (50-60 Hz) high electric fields (0-200 kV.cm/sup -1/) using a LiNbO/sub 3/ crystal as sensing medium without any contacting electrode. Thus, good galvanic insulation of material and person is obtained. An experimental setup developed in the laboratory by electro-optical effect or Pockels effect, several measurements are realized. Simulations performed with finite element method (FEM) to optimize device. Experimental...
Finite element modeling is used in this study to optimize the electromechanical behavior of 0–3 composites according material properties their constituents. Our approach considers an 'extended' 2D representative volume (RVE) with randomly dispersed piezoelectric particles. A variable distribution polarization axes also implemented because a full periodic arrangement fillers and unique poling orientation are unrealistic practice. Comparisons simpler RVE analytical model based on Mori–Tanaka...
Spherical nanocrystals of iron iodate (Fe(IO3)3) as well different hierarchically organized hybrid superstructures are synthesized at 80 °C from AOT-based water-in-oil microemulsions. For a fixed reaction time 2 h, initial addition PEG molecules and changes in the water/surfactant molar ratio w allow modification interactions between surfactant surface amorphous precursor particles. At low water content (w = 5.8), adsorption AOT inhibits formation crystallized nanoparticles if amount added...
Abstract The exact molecular reaction pathway and crystallization mechanisms of LiNbO 3 nanoparticles under solvothermal conditions are derived through extensive time‐ temperature‐resolved experiments allowing to track all the transient solid species. Starting with a simple mixing Li/Nb ethoxides, water addition is used promote condensation after ligand exchange different co‐solvents including alcohols glycols variable carbon‐chain length. A nonclassical nucleation scheme first demonstrated...
A Laponite clay-based lithium iodate nanocomposite have been synthesized for nonlinear optical applications. After addition of aqueous solution to a colloidal suspension JS, thin layers are elaborated from this sol using dip-coating technique. drying and heat treatments between 150 220°C, LiIO3 crystallizes in the matrix with nanometer size. As result their strong dipolar moment, crystals can be orientated under an external electric field during nucleation. Planar waveguides on glass...
We have developed LiIO3/laponite nanocomposite thin films to form waveguides with quadratic nonlinear optical properties. The are dip-coated and annealed induce LiIO3 crystallisation within the laponite matrix. nanocrystal orientation can be controlled using an electric field during annealing process. In this article we perform characterisations of through m-line spectroscopy second harmonic generation microscopy (SHGM). Both refractive indexes deduced from spectra SHG signal shown depend on...