A5004659389- Plasmonic and Surface Plasmon Research
- Photonic Crystals and Applications
- Photonic and Optical Devices
- Optical Coatings and Gratings
- Metamaterials and Metasurfaces Applications
- Quantum Dots Synthesis And Properties
- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced Antenna and Metasurface Technologies
- Near-Field Optical Microscopy
- Microwave Engineering and Waveguides
- Mechanical and Optical Resonators
- Orbital Angular Momentum in Optics
- Chalcogenide Semiconductor Thin Films
- Strong Light-Matter Interactions
- Terahertz technology and applications
- Gyrotron and Vacuum Electronics Research
- Antenna Design and Analysis
- Semiconductor Lasers and Optical Devices
- Nonlinear Optical Materials Studies
- Microwave Dielectric Ceramics Synthesis
- Advanced Fiber Optic Sensors
- Quantum Information and Cryptography
- Magneto-Optical Properties and Applications
- 2D Materials and Applications
- Surface Roughness and Optical Measurements
Centre National de la Recherche Scientifique
2015-2025
Université Paris Cité
2020-2025
Laboratoire Matériaux et Phénomènes Quantiques
2020-2025
Sorbonne Paris Cité
2024
Centre de Gestion Scientifique
2023
Université Paris-Sud
2010-2018
Université Paris-Saclay
2016-2018
Centre de Nanosciences et de Nanotechnologies
2016-2018
Institut Supérieur d'Électronique de Paris
2010-2014
Université de Strasbourg
2012
Light usually diffracts in all directions when it emerges from a subwavelength aperture, which puts lower limit on the size of features that can be used photonics. This limitation overcome by creating periodic texture exit side single aperture metal film. The transmitted light as beam with small angular divergence (approximately +/-3 degrees ) whose directionality controlled. finding is especially surprising, considering radiating region mainly confined to an area lateral dimensions...
We present a theoretical foundation for the beaming of light displayed by single subwavelength aperture in an appropriately corrugated metal film [H. J. Lezec et al., Science 297, 820 (2002)]. Good agreement is found between calculations and experimental data. show that due to formation electromagnetic surface resonances beam direction, width, wavelength at which it occurs can be selected tuning geometrical parameters structure.
We present an experimental analysis of the plasmonic scattering properties gold nanoparticles controllably placed nanometers away from a metal film. show that spectral response this system results interplay between localized plasmon resonance nanoparticle and surface polaritons film, as previously predicted by theoretical studies. In addition, we report film induces polarization to single light scattering, resulting in doughnut-shaped point spread function when imaged far-field. Both effects...
We studied the role of aperture depth on enhanced transmission light through subwavelength holes in free-standing Ag films by measuring properties square arrays cylindrical holes. Two regimes are found which give insight into mechanism and will be importance for device applications.
We have analyzed the transmission process through single subwavelength apertures surrounded by a set of periodic grooves in optically thick Ag films. On one hand, we found that intensity both single- and double-corrugated structures follows just exponential regime as function hole depth. other it is shown can be separated into three independent steps: coupling in, aperture out. This contrast with arrays reported previous studies where two regimes were found. These findings are relevance not...
We perform a series of simulations and experiments at microwave frequencies where we dynamically alter the magnetic resonance one individual split ring resonator by photodoping piece low-doped semiconductor positioned within gap resonator. predict experimentally achieve complete suppression amplitude using an 815 nm laser source then briefly consider problem tuning frequency SRR same method. also illustrate metamaterial approach to active electromagnetic devices implementing simple yet...
Negative index-of-refraction materials (NIMs) require both the electric permittivity and magnetic permeability of material to be negative. Most reported NIMs have combined conducting split ring resonators (SRRs) realize response nonresonant wires response. Here, however, authors demonstrate an impedance-matched, relatively broadband NIM which makes use SRRs resonators, tuned such that they resonate at same frequency with nearly dispersion. The properties are confirmed by direct measurements...
Abstract Tunable generation of vortex beams holds relevance in various fields, including communications and sensing. In this paper, we demonstrate the feasibility nonlinear spin-orbit interactions thin films materials with second-order susceptibility. Remarkably, tensor can mix longitudinal transverse components pump field. We observe experimentally our theoretical predictions process second-harmonic from a film aluminum gallium arsenide, material platform widely spread for its role...
We perform an experimental study of the phase and amplitude microwaves interacting with scattered by two-dimensional negative index metamaterials. The measurements are performed in a parallel plate waveguide apparatus at X-band frequencies (8-12 GHz), thus constraining electromagnetic fields to two dimensions. A detection antenna is fixed one plates, while second source or translated relative first plate. inserted into, but not protruding below, stationary so that internal metamaterial...
We investigate transmission efficiency and finite size effects for the subwavelength hole arrays. Experiments simulations show how depend strongly on diameter. The reaches an asymptotic upper value when array is larger than surface plasmon propagation length corrugated surface. By comparing of arrays with that corresponding single holes, relative enhancement found to increase as diameter decreases. In conditions experiments one two orders magnitude but there no fundamental limit this value.
We present simulations of plasmonic transmission lines consisting planar metal strips embedded in isotropic dielectric media, with a particular emphasis on the long-range surface plasmon polariton (SPP) modes that can be supported such structures. Our computational method is based analyzing eigenfrequencies corresponding to wave equation subject mixture periodic, electric and magnetic boundary conditions. demonstrate accuracy our approach through comparisons previously reported...
Arrays of metallic nanoparticles can support mixed plasmon-photonic resonances known as lattice surface modes. Their properties are well known, but a general strategy to control their is still lacking. In this article, we offer perspective on the formation these modes and show that excitation depends constructive destructive interferences between field light scattered by resonant nanoparticles. It therefore possible design response system through careful choice conditions and/or tuning...
Abstract As they have gained maturity, colloidal nanocrystals (NCs) also expand the spectral range over of which could be used for photonic and optoelectronic applications. In particular, infrared use NCs has become utmost interest to develop cost‐effective alternatives current technologies. It is then critical not let material dictate light–matter interaction, why coupling cavities been proposed. For NCs, this approach first devoted control absorption with in mind increase signal magnitude...
Abstract Vortex beams are currently drawing a great deal of interest, from fundamental research to several promising applications. While their generation in bulky optical devices limits use integrated complex systems, metasurfaces have recently proven successful creating vortices, especially the linear regime. In nonlinear domain, strategic importance for future classical and quantum information, date orbital angular momentum has only been created qualitative ways, without discussing...
Abstract Nanocrystals (NCs) appear as a promising platform for cost effective infrared optoelectronics, while offering simplified coupling to the CMOS platform. However, this perspective is slowed down by toxicity concerns, most materials being based on Pb and Hg. There currently large effort bring forth new platforms that are active in with reduced heavy metal content. Here, focus silver chalcogenides, which, thanks combination of inter‐ intraband transitions, suited cover both short mid...
We have designed, fabricated and characterized integrated directional couplers capable of converting the mode an optical dielectric waveguide into a long-range plasmon propagating along thin metal stripe. demonstrate that coupling between two types waveguides is generally very weak unless specific conditions are met. This sensitivity could be potentially exploited in sensing applications or for developing novel active photonic components.
Abstract HgTe nanocrystals offer a unique spectral tunability with both absorption and emission covering the near mid‐infrared as well THz window. Nevertheless, very limited amount of work is dedicated to electroluminescence from this material. An efficient diode not only requires designing structure that achieves high electrical efficiency (i.e., electron hole injections), but also finding way efficiently extract emitted photons. The shift visible infrared certainly demands revisiting...
We study the properties of an array Au ring nanoantennas fed by ensemble coherent emitters. The luminescence emitters is strongly enhanced at certain wavelengths due to excitation two types resonances-the diffractive Rayleigh anomalies associated with opening new diffraction orders and localized surface plasmons nanoantennas. show that families resonances can spectrally overlap lead anticrossings or cumulative enhancements depending on symmetries modes. This rich optical behavior induces...
We investigate both experimentally and theoretically the far-field diffraction patterns of single circular apertures as a function their diameters d at given illumination wavelength λ. observe transition between well-known pseudoscalar regime large holes (d≫λ) less-known vectorial subwavelength ones (d≪λ). Four different regimes are identified for d/λ regions, each one with its polarization dependence. A thorough comparison theoretical model, which takes into account finite hole size...
Abstract The advent of metamaterials more than 15 years ago has offered extraordinary new ways manipulating electromagnetic waves. Yet, progress in this field been unequal across the spectrum, especially when it comes to finding applications for such artificial media. Optical metamaterials, particular, are less compatible with active functionalities their counterparts developed at lower frequencies. One crucial roadblock path devices is fact that optical so far controlled by light rather...
We examine, in the time domain, influence of Au antenna arrays (i.e., metasurfaces) on thin films near-infrared PbS nanocrystals that mutually interact via Förster resonance energy transfer (FRET). While geometry and optical properties have a direct sometimes spectacular impact transient photoluminescence spectra emitters, we experimentally show decay rates at any given wavelength are remarkably similar for all samples. This observation is stark contrast with textbook case individual...