A5074858921- Plasmonic and Surface Plasmon Research
- Metamaterials and Metasurfaces Applications
- Photonic and Optical Devices
- Advanced Antenna and Metasurface Technologies
- Photonic Crystals and Applications
- Mechanical and Optical Resonators
- Optical Coherence Tomography Applications
- Neural Networks and Reservoir Computing
- Advanced Fiber Laser Technologies
- Terahertz technology and applications
- Digital Holography and Microscopy
- Optical Network Technologies
- Photoacoustic and Ultrasonic Imaging
- Advanced Optical Imaging Technologies
- Advanced biosensing and bioanalysis techniques
- Additive Manufacturing and 3D Printing Technologies
- Carbon Nanotubes in Composites
- Seismic Imaging and Inversion Techniques
- Orbital Angular Momentum in Optics
- Geophysical Methods and Applications
- Semiconductor Lasers and Optical Devices
- Random lasers and scattering media
- Advanced Fiber Optic Sensors
- Molecular Communication and Nanonetworks
- Microwave Engineering and Waveguides
Laboratoire Matériaux et Phénomènes Quantiques
2019-2024
Université Paris Cité
2018-2024
Centre National de la Recherche Scientifique
2019-2024
École Polytechnique Fédérale de Lausanne
2019-2024
Délégation Paris 7
2018-2021
Polytechnic University of Turin
2018
Optical metasurfaces, i.e. arrays of nanoantennas with sub-wavelength size and separation, enable the manipulation light-matter interactions in miniaturized optical components no classical counterparts. Six decades after first observation second harmonic generation (SHG) bulk crystals, these devices are expected to break new ground field nonlinear optics, shifting focus from phase matching approach achieved within long propagation distances that near-field resonances interplay leaky...
Entangled photon states are a fundamental resource for optical quantum technologies and investigating the predictions of mechanics. Up to now such mainly generated in macroscopic nonlinear systems with elaborately tailored properties. In this theoretical work, we extend understanding on generation entangled photonic toward nanoscale regime by properties photon-pair sub-wavelength nanoresonators. Taking materials Zinc-Blende structure as an example, reveal that can naturally generate various...
Optical dielectric metasurfaces composed of arrayed nanostructures are expected to enable arbitrary spatial control incident wavefronts with subwavelength resolution. For phase modulation, one often resorts two physical effects implement a 2\pi-phase excursion. The first effect relies on guidance by tall nanoscale pillars and the second exploits resonant confinement nanoresonators degenerate Mie-resonances. approach requires high aspect ratios, while one, known as Huygens metasurfaces, is...
The ever-increasing demand for training and inferring with larger machine-learning models requires more efficient hardware solutions due to limitations such as power dissipation scalability. Optics is a promising contender providing lower computation, since light propagation through nonabsorbing medium lossless operation. However, carry out useful computations light, generating controlling nonlinearity optically necessity that still elusive. Multimode fibers (MMFs) have been shown they can...
All-dielectric metasurfaces consist of two-dimensional arrangements nanoresonators and are paramount importance for shaping polarization, phase, amplitude both fundamental harmonic optical waves. To date, their reported nonlinear properties have been dominated by local features the individual nanoresonators. However, collective responses typical either Mie-resonant metamaterials or photonic crystals can potentially boost control over such properties. In this work we demonstrate generation a...
A novel theoretical non-Hermitian formalism for analyzing nonlinear nano-optics is proposed. Its main strength lies in the unique way it analytically incorporates quasinormal modes of nanostructures, which have to be resonantly excited achieve significant efficiency. Owing analyticity, computationally more effective than usual multipolar Mie-scattering expansions nano-optics. It also general and applies nanostructures laying on substrates or embedded thin films. additionally provides...
Nonlinear metasurfaces have recently brought harmonic generation to subwavelength level, with spectral and polarization control unachievable in bulk crystals. Not only does nonlinear meta-optics enable the investigation of physics at nanoscale, but it also opens promising technological perspectives. To date, however, no full-phase has been demonstrated on a field generated sufficient efficiency for most practical purposes. In this work, based <mml:math...
We demonstrate optically tunable control of second-harmonic generation in all-dielectric nanoantennas: by using a beam that is absorbed the nanoresonator, we thermo-optically change refractive index radiating element to modulate amplitude signal. For moderate temperature increase roughly 40 K, modulation efficiency up 60% demonstrated; this large tunability single meta-atom response paves way exciting avenues for reconfigurable homogeneous and heterogeneous metasurfaces.
We propose a physics-informed neural network (PINN) as the forward model for tomographic reconstructions of biological samples. demonstrate that by training this with Helmholtz equation physical loss, we can predict scattered field accurately. It will be shown pretrained fine-tuned different samples and used solving scattering problem much faster than other numerical solutions. evaluate our methodology experimental results. Our PINNs generalized any inverse problem.
The omnipresence of salts in biofluids creates a pervasive challenge designing sensors suitable for vivo applications. Fluctuations ion concentrations have been shown to affect the sensitivity and selectivity optical based on single-walled carbon nanotubes wrapped with single-stranded DNA (ssDNA–SWCNTs). We herein observe fluorescence wavelength shifting ssDNA–SWCNT-based presence divalent cations at above 3.5 mM. In contrast, no was observed up 350 mM bioengineered increased rigidity using...
Tomographic Volumetric Additive Manufacturing (TVAM) allows printing of mesoscopic objects within seconds or minutes. In TVAM, tomographic patterns are illuminated onto a rotating glass vial which contains photosensitive resin. Current pattern optimization is based on ray optical assumption ultimately leads to limited resolution around 20 µm and varying throughout the volume 3D object. this work, we introduce rigorous wave-based amplitude scheme for TVAM shows that high-resolution...
Abstract Metasurfaces represent a new frontier in materials science paving for unprecedented methods of controlling electromagnetic waves, with range applications spanning from sensing to imaging and communications. For pulsed terahertz (THz) generation, metasurfaces offer gateway tuneable thin emitters that can be utilized large‐area imaging, microscopy, spectroscopy. In literature, THz‐emitting generally exhibit high absorption, being based either on metals or semiconductors excited highly...
Abstract Phase imaging is widely used in biomedical imaging, sensing, and material characterization, among other fields. However, direct of phase objects with subwavelength resolution remains a challenge. Here, we demonstrate amplitude based on all-optical diffractive encoding decoding. To resolve features an object, the imager uses thin, high-index solid-immersion layer to transmit high-frequency information object spatially-optimized encoder, which converts/encodes input into low-frequency...
High-permittivity III-V semiconductor nanocavities have shown huge potential for enhanced nonlinear light-matter interactions at the nanoscale. In particular, Second Harmonic (SH) generation in AlGaAs nanoantennas can be extremely efficient; however, vertical emission is difficult to achieve, due zincblende χ <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">(2)</sup> tensor and epitaxially growth on (100) substrates. Here, we demonstrate that...
Abstract Metasurfaces have recently gained extensive interest because of their extraordinary optical behavior as artificial material interfaces with ultrahigh compactness. In this framework, dielectric platforms newly become very promising for nonlinear nanophotonics, providing opportunities, especially ultrafast switching, and high harmonic generation, opening the research field metaoptics. Up to now, metaoptics been mostly explored using single metasurfaces. However, in a long-term vision,...
Deep neural networks trained on physical losses are emerging as promising surrogates for nonlinear numerical solvers. These tools can predict solutions to Maxwell’s equations and compute gradients of output fields with respect the material geometrical properties in millisecond times which makes them attractive inverse design or scattering applications. Here we develop a tunable version MaxwellNet incident power, physics driven network able light from inhomogenous media size comparable...
High refractive index dielectric nanostructures can be exploited to enhance nonlinear optical processes via the strong light confinement by their resonant modes. The sensitive dependence of these modes on geometry and material composition offers ample opportunities for tailoring response system. Here we report sum-frequency generation (SFG) individual AlGaAs nanocylinders, pumped two pulsed beams at a telecommunication frequency, ω, its duplicate, 2ω. Under such scheme, SFG 3ω = ω + 2ω is...
We experimentally demonstrate the capability of semiconductor monolithic metasurfaces to control polarization state optical second-harmonic generation. Based on properties single Mie-resonator scattering, we design and fabricate AlGaAs-on-insulator whose spatial periodicity allows us decouple diffraction features. This enables collection a polarization-engineered harmonic field in small solid angle around zero-diffraction order. Our rely AlGaAs/AlAs/GaAs metal-organic chemical vapor...
Metal-less nanophotonics offers new opportunities for nonlinear optics with respect to waveguides, and advancements in nanofabrication enabled the development of dielectric subwavelength Mie-type structures. Here we review recent results on second harmonic generation semiconductor nanoresonators, focusing their Mie-scattering features terms efficiency control over radiation pattern. Firstly, two theoretical models are comparatively discussed, a view possible improvements analysis design....
Electronic computers have evolved drastically over the past years with an ever-growing demand for improved performance. However, transfer of information from memory and high energy consumption emerged as issues that require solutions. Optical techniques are considered promising solutions to these problems higher speed than their electronic counterparts reduced consumption. Here, we use optical reservoir computing framework previously described (Scalable Learning Operator or SOLO [1]) program...
Reconfigurable metasurfaces have recently gained a lot of attention in applications such as adaptive meta-lenses, hyperspectral imaging and optical modulation. This kind metastructure can be obtained by an external control signal, enabling us to dynamically manipulate the electromagnetic radiation. Here, we theoretically propose AlGaAs device second harmonic generation (SHG) emission at nanoscale upon optimized heating. The asymmetric shape used meta-atom is selected guarantee predominant...
Phase imaging is widely used in biomedical imaging, sensing, and material characterization, among other fields. However, direct of phase objects with subwavelength resolution remains a challenge. Here, we demonstrate amplitude based on all-optical diffractive encoding decoding. To resolve features an object, the imager uses thin, high-index solid-immersion layer to transmit high-frequency information object spatially-optimized encoder, which converts/encodes input into low-frequency spatial...