A5087287841- Orbital Angular Momentum in Optics
- Liquid Crystal Research Advancements
- Photonic Crystals and Applications
- Optical Polarization and Ellipsometry
- Near-Field Optical Microscopy
- Nonlinear Dynamics and Pattern Formation
- Photonic and Optical Devices
- Plasmonic and Surface Plasmon Research
- Plant Reproductive Biology
- Microfluidic and Bio-sensing Technologies
- Molecular spectroscopy and chirality
- Nonlinear Optical Materials Studies
- Metamaterials and Metasurfaces Applications
- Laser Material Processing Techniques
- Mechanical and Optical Resonators
- Laser-Matter Interactions and Applications
- Digital Holography and Microscopy
- Optical Coatings and Gratings
- Quantum optics and atomic interactions
- Plant and animal studies
- Experimental and Theoretical Physics Studies
- Cold Atom Physics and Bose-Einstein Condensates
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Laser Technologies
- Nonlinear Photonic Systems
Université de Bordeaux
2016-2025
Centre National de la Recherche Scientifique
2016-2025
Laboratoire Ondes et Matière d'Aquitaine
2016-2025
Swinburne University of Technology
2010-2015
Centre de Haute Energie
2008-2010
Laboratoire de Photonique Quantique et Moléculaire
2002-2006
École Normale Supérieure de Lyon
2005-2006
Laboratoire de Physique de l'ENS de Lyon
2005-2006
Cité Internationale Universitaire de Paris
2005
École Normale Supérieure Paris-Saclay
2002-2004
Abstract Structured waves are ubiquitous for all areas of wave physics, both classical and quantum, where the wavefields inhomogeneous cannot be approximated by a single plane wave. Even interference two waves, or (evanescent) wave, provides number nontrivial phenomena additional functionalities as compared to Complex with inhomogeneities in amplitude, phase, polarization, including topological structures singularities, underpin modern nanooptics photonics, yet they equally important, e.g....
We report on the generation of mono- and polychromatic optical phase singularities from micron-sized birefringent droplets. This is done experimentally by using liquid crystal droplets whose three dimensional architecture axis controlled within bulk surfactant agents. Because its microscopic size these vortex generators are optically trapped manipulated at will, thus realizing a robust self-aligned micro-optical device for orbital angular momentum conversion. Experimental observations...
We report on the first quantitative test of acoustic orbital angular momentum transfer to a sound absorbing object immersed in viscous liquid. This is done by realizing an original experiment that spin millimeter-size target disk using ultrasonic vortex beam. demonstrate balance between radiation torque calculated from Brillouin stress tensor and evaluated steady state spinning frequency. Moreover, we unveil rotational streaming phenomenon results host fluid. show it lowers torque, thereby...
Direct femtosecond laser photopolymerization is used to fabricate high resolution microscopic spiral phase plates. The total change all around their center prepared be a integer multiple of 2π for the operating wavelength in visible domain. optical performances plates are measured and we propose simple single beam interferometric technique characterize singularity generated vortex beams. experimental results compared simulations satisfying agreement obtained. Potential large scale...
We describe how the propagation of light through uniaxial crystals can be used as a versatile tool towards spatial engineering polarization and phase, thereby providing an all-optical technique for vectorial scalar singular beam shaping in optics.Besides prominent role played by linear birefringence, influence circular birefringence (the optical activity) is discussed well both monochromatic polychromatic strategies are addressed.Under cylindrically symmetric light-matter interaction,...
Abstract Topology is a universal concept that encountered in daily life and known to determine many static dynamical properties of matter. Taming controlling the topology materials therefore constitutes contemporary interdisciplinary challenge. Building on controllable spatial soft matter appears as relevant strategy address challenge, particular, because it may lead paradigmatic model systems allow checking theories experimentally. Here we report experimentally wealth complex free-standing...
Polarization singularities and topological polarization structures are generic features of inhomogeneous vector wave fields any nature. However, their experimental studies mostly remain restricted to optical waves. Here, we report the observation singularities, Möbius-strip structures, skyrmionic textures in 3D sound Our experiments made ultrasonic domain using nonparaxial propagating generated by space-variant 2D acoustic sources. We also retrieve distributions spin density these fields....
Abstract Laser exposure defines voxel's dimensions as essential building blocks in direct write 3D nanolithography. However, the conditions not only influence size of produced features but also their optical properties. This empowers realization an adjustable refractive index out single material by varying writing strategy while preserving laser nanolithography's flexibility geometry and high resolution. Here, for 450–1600 nm spectral range micro‐optics SZ2080 hybrid polymer is...
We study theoretically and verify experimentally the detailed dynamics of spin-to-orbital angular momentum conversion for a circularly polarized Gaussian beam propagating along optical axis uniaxial crystal. extend results to case white-light beams when each spectral components undergoes its own wavelength-dependent process.
We report on the generation of tunable structured light fields endowed with various sets phase singularities from a single topological defect in nematic liquid crystal mesophase. The experimental demonstration relies use electric field-induced nonsingular defects called "umbilics."
We demonstrate how to achieve reversible nonreciprocal optical response in a periodic photonic structure with pair of defects, one them being nonlinear liquid crystal defect layer. The twin is symmetric at low intensity and becomes asymmetric above an threshold that corresponds the reordering crystal. show effects can be reversed by changing wavelength as consequence dependent light localization mode inside structure.
We report on the fabrication and characterization of micro-optical elements with typical size 100 μm, which enable production pseudo-nondiffracting optical vortex beams arbitrary order. This is made possible from monolithic integration spiral phase plates axicons into helical by direct laser writing using femtosecond nanopolymerization. The performances fabricated three-dimensional singular microstructures are experimentally measured compared their expected theoretical behavior, both in...
We report on highly reflective spin-orbit geometric phase optical elements based a helicity-preserving circular Bragg-reflection phenomenon. First, we present dynamical experiment using flat chiral Bragg mirror. Then, show that shaping such allows the efficient tailoring of light fields without need to fulfill any condition birefringent retardation, in contrast case transmission elements. This is illustrated by vortex generation from liquid crystal droplets regime unveils consequences...
We propose the development of a high-contrast imaging technique enabling simultaneous and selective nulling several light sources. This is done by realizing reconfigurable multiple-vortex phase mask made liquid crystal thin film on which local topological features can be addressed electro-optically. The method illustrated reporting triple-star optical vortex coronagraphy laboratory demonstration, easily extended to higher multiplicity. These results allow considering direct observation...
Submicron‐thick gold films endowed with subwavelength patterning allow on‐demand topological shaping of light, hence the precise delivery optical orbital angular momentum. Several kinds metallic metasurfaces enabling generation vortices arbitrary charges in visible domain are fabricated following a design based on space‐variant grating discrete orientational distribution. The performances obtained flat spin–orbit elements designed to operate at 532 nm wavelength experimentally assessed and...
We report on a chiral optical Stern-Gerlach experiment where liquid crystal microspheres are selectively displaced by means of forces arising from helicity gradients. The present Newtonian experimental demonstration an effect predicted at molecular scale [New J. Phys. 16, 013020 (2014)] is first instrumental step in area restricted so far to theoretical discussions. Extending the legacy light-matter interactions should foster further studies, for instance towards elaboration...
Stimulated emission depletion (STED) microscopy has emerged as a powerful technique providing visualization of biological structures at the molecular level in living samples. In this technique, diffraction limit is broken by selectively depleting fluorophore's excited state stimulated emission, typically using donut-shaped optical vortex beam. STED performs exceptionally well degraded conditions, such tissues. Nevertheless, photobleaching and acquisition time are among main challenges for...
We propose a discrete set of continuous deformation circular nanoslit to generate and control optical vortices at the microscopic scale. The process relies on interplay between spin orbital angular momentum degrees freedom light mediated by appropriate closed-path nanoslits milled thin gold film. Topological shaping is experimentally demonstrated in visible domain. Moreover, all experimental observations are quantitatively validated simple model that takes into account transverse...