A5084710333- Optical Coherence Tomography Applications
- Random lasers and scattering media
- Orbital Angular Momentum in Optics
- Photonic and Optical Devices
- Photonic Crystal and Fiber Optics
- Mechanical and Optical Resonators
- Photoacoustic and Ultrasonic Imaging
- Advanced Fluorescence Microscopy Techniques
- Advanced Fiber Laser Technologies
- Advanced MEMS and NEMS Technologies
- Advanced X-ray Imaging Techniques
- Digital Holography and Microscopy
- Laser-Matter Interactions and Applications
- Near-Field Optical Microscopy
- Esophageal Cancer Research and Treatment
- Classical Antiquity Studies
- Neurobiology and Insect Physiology Research
- Advanced Optical Sensing Technologies
- Optical Wireless Communication Technologies
- Solid State Laser Technologies
- Strong Light-Matter Interactions
- Byzantine Studies and History
- Neural Networks and Reservoir Computing
- Molecular Junctions and Nanostructures
- Optical Systems and Laser Technology
Institut Fresnel
2016-2023
Centrale Marseille
2016-2022
Aix-Marseille Université
2016-2022
Centre National de la Recherche Scientifique
2012-2020
Château Gombert
2020
Mosaic Company (United States)
2019
Laboratoire Photonique, Numérique et Nanosciences
2015-2017
Université Paris-Saclay
2016
École Normale Supérieure - PSL
2013
École Normale Supérieure Paris-Saclay
2012
We investigate the lasing spectra, threshold gain values, and emission directionalities for a two-dimensional microcavity laser with "kite" contour. The cavity modes are considered accurately using linear electromagnetic formalism of eigenvalue problem exact boundary radiation conditions. develop numerical algorithm based on Muller integral equations discretized Nystrom technique, which has theoretically justified fast convergence. influence deviation from circular shape modal...
We investigate lensless endoscopy using coherent beam combining and aperiodic multicore fibers (MCF). show that diffracted orders, inherent to MCF with periodically arranged cores, dramatically reduce the field-of-view (FoV), randomness in core positions can increase FoV up diffraction limit set by a single fiber core, while maintaining experimental feasibility. demonstrate experimentally pixelation-free imaging over 120 μm an designed widely spaced cores. this system is suitable perform...
We report two-photon lensless imaging through a novel Fermat's golden spiral multicore fiber. This unique layout optimizes the sidelobe levels, field of view, crosstalk, group delay, and mode density to achieve contrast at least 10.9 dB. demonstrate experimentally ability generate scan focal point with femtosecond pulses perform imaging.
We report the fabrication and characterization of first double clad tubular anti-resonant hollow core fiber. It allows to deliver ultrashort pulses without temporal nor spectral distortions in 700-1000 nm wavelength range efficiently collect scattered light a high numerical aperture clad. The output fiber mode is shaped with silica microsphere generating photonic nanojet, making it well suitable for nonlinear microendoscopy application. Additionally, we provide an open access software...
In this Letter, we report a high-efficiency, miniaturized, ultra-fast coherent beam, combined with 3D-printed micro-optics directly on the tip of multicore fiber bundle. The highly compact device footprint (180 µm in diameter) facilitates its incorporation into minimally invasive ultra-thin nonlinear endoscope to perform two-photon imaging.
Abstract Optomechanical systems, in which the vibrations of a mechanical resonator are coupled to an electromagnetic radiation, have permitted investigation wealth novel physical effects. To fully exploit these phenomena realistic circuits and achieve different functionalities on single chip, integration optomechanical resonators is mandatory. Here, we propose approach heterogeneously integrate arrays two-dimensional photonic crystal defect cavities top silicon-on-insulator waveguides. The...
The polarization states of lasers are crucial issues both for practical applications and fundamental research. In general, they depend in a combined manner on the properties gain material structure electromagnetic modes. this paper, we address issue case solid-state organic lasers, technology which enables to vary independently mode properties. Different kinds resonators investigated: in-plane micro-resonators with Fabry-Perot, square, pentagon, stadium, disk, kite shapes, external vertical...
We demonstrate pixelation-free real-time widefield endoscopic imaging through an aperiodic multicore fiber (MCF) without any distal opto-mechanical elements or proximal scanners. Exploiting the memory effect in MCFs, images our system are directly obtained post-processing using a static wavefront correction from single calibration procedure. Our approach allows for video-rate 3D of incoherently illuminated objects with speed not limited by wavefront-shaping device refresh rate.
The lensless endoscope represents the ultimate limit in miniaturization of imaging tools: an image can be transmitted through a (multi-mode or multi-core) fiber by numerical physical inversion fiber's pre-measured transmission matrix.However, matrix changes completely with only minute conformational fiber, which has so far limited endoscopes to fibers that must kept static.In this paper, we report for first time, best our knowledge, is exempt from requirement static designing and employing...
We examine the impact of fiber bends on ultrashort pulse propagation in a 169-core multicore (MCF) by numerical simulations and experimental measurements. show that an L-shaped bend (where only one end MCF is fixed) induces significant changes group delays are function core position but linear along bending axis with slope directly proportional to angle. For U- S-shaped both ends induced refractive index delay much smaller than residual, intrinsic inter-core differences unbent MCF. further...
Multicore fiber bundles are widely used in endoscopy due to their miniature size and direct imaging capabilities. They have recently been used, combination with spatial light modulators, various realizations of little or no optics at the distal end. These schemes require characterization relative phase offsets between different cores, typically done using off-axis holography, thus requiring both an interferometric setup and, typically, access tip. Here we explore possibility employing...
A simple technique for far-field single-shot non-interferometric determination of the phase transmission matrix a multicore fiber with over 100 cores is presented. This retrieval relies on aperiodic arrangement cores.
We investigate the non-linear mechanical dynamics of a nano-optomechanical mirror formed by suspended membrane pierced photonic crystal. By applying to periodic electrostatic force induced interdigitated electrodes integrated below membrane, we evidence superharmonic resonances our nano-electro-mechanical system; constant phase shift oscillator across resonance tongues is observed on onset principal harmonic and subharmonic excitation regimes.
We report on optomechanical effects in 2D photonic crystal defect cavities coupled to integrated silicon waveguides of different widths. Mechanical modes are observed systematically a chip scale. By tuning the excitation laser wavelength, we observe optical spring effects. extract coupling coefficients and demonstrate dispersive dissipative nature coupling. Their relative contribution can be controlled by modifying access waveguide width, thereby paving way for control wafer level.
We take stock of the progress made into developing fiber-optic ultra-thin endoscopes assisted by wave front shaping. focus on multi-core fiber-based lensless intended for multi-photon imaging. put work perspective and outline remaining challenges.
Cavity optomechanical systems with an enhanced coupling between mechanical motion and electromagnetic radiation have permitted the investigation of many novel physical effects. The in majority these is dispersive nature: cavity resonance frequency modulated by vibrations oscillator. Dissipative interaction, where photon lifetime motion, has recently attracted considerable interest opens new avenues control sensing. In this work we demonstrate external optical over dissipative strength...
Multicore fiber bundles are attractive candidates for lensless endscopes because of their ruggedness and the relative simplicity involved in calibration operation. Nevertheless, measurement transmission matrix MCF is still an interferometric process, typically requiring high stability possibly sequential measurements. A key challenge to replace this with a much simpler robust technique – phase retrieval. In talk, we will examine major using retrieval conventional MCFs. This related discrete...
We report a bending-insensitive multi-core fiber (MCF) for lensless endoscopy imaging with modified geometry that enables optimal light coupling in and out of the individual cores. In previously reported bending insensitive MCF (twisted MCF), cores are twisted along length allowing development flexible thin endoscopes potential applications dynamic freely moving experiments. However, such MCFs seen to have an optimum angle which is proportional their radial distance from center MCF. This...
The periodic arrangement of core positions in multi-core fiber bundles introduces 'ghost' artifacts to endoscopic images obtained through them, whether wide-field imaging (based on either direct or speckle correlations) confocal scanning microscopy using wavefront shaping. Here we introduce partially disordered as a means overcome these artifacts. benefits their use will be discussed the context multiphoton utilizing spatial light modulator proximal end, and more general case widefield...
We present our recent progress in developing a two-photon lensless endoscope based on ultrathin multicore fiber and wavefront shaping. discuss the field-of-view extension, intrinsic group delay compensation bending such devices with aim of imaging deep brain minimal invasion.