Observation of surface-plasmon phenomena that are dependent upon the handedness circularly polarized incident light (spin) is presented. The polarization-dependent near-field intensity distribution obtained in our experiment attributed to presence a geometric phase arising from interaction with an anisotropic and inhomogeneous nanoscale structure. A vortex surface mode spin-dependent topological charge was plasmonic microcavity. remarkable phenomenon polarization-sensitive focusing structure...

We examine the spin-orbit coupling effects that appear when a wave carrying intrinsic angular momentum interacts with medium. The Berry phase is shown to be manifestation of Coriolis effect in noninertial reference frame attached wave. In most general case, both direction propagation and state are varied, given by simple expression unifies spin redirection Pancharatnam-Berry phase. theory supported experiment demonstrating electromagnetic waves via surface plasmon nanostructure. measurements...

Observation of optical spin Hall effects (OSHEs) manifested by a spin-dependent momentum redirection is presented. The effect occurring solely as result the curvature coupled localized plasmonic chain regarded locally isotropic OSHE, while anisotropic OSHE arises from interaction between and local anisotropy mode rotating along chain. A wavefront phase dislocation was observed in circular curvature, which strength enhanced effect.

We examine, both experimentally and theoretically, an interaction of tightly focused polarized light with a slit on metal surface supporting plasmon-polariton modes. Remarkably, this simple system can be highly sensitive to the polarization incident offers perfect quantum-weak-measurement tool built-in post-selection in mode. observe plasmonic spin Hall effect coordinate momentum spaces which is interpreted as weak measurements helicity real imaginary values determined by input polarization....

Observation of a spin symmetry breaking effect in plasmonic nanoscale structures due to spin-orbit interaction is presented. We demonstrate nanoplasmonic structure which exhibits crucial role an angular momentum (AM) selection rule light-surface plasmon scattering process. In our experiment, the intrinsic AM (spin) incident radiation coupled extrinsic (orbital AM) surface plasmons via interaction. Due this effect, we achieved spin-controlled enhanced transmission through coaxial nanoaperture.

We demonstrate orbital angular momentum (OAM) transfer by chiral plasmonic nanostructures designed on both sides of a thin suspended metallic membrane. show how far-field vortex beams with tunable OAM indices can be tailored through nanostructure designs. reveal the crucial role played central aperture that connects two membrane from which selection rules are derived in perfect agreement experimental data.

We demonstrate room temperature chiral coupling of valley excitons in a transition metal dichalcogenide monolayer with spin-momentum locked surface plasmons. At the onset strong regime, we measure spin-selective excitation directional flows polaritons. Operating under such conditions, our platform yields surprisingly robust intervalley contrasts (ca. 40%) and coherence 5–8%) as opposed to their total absence for uncoupled at temperature. These results open rich possibilities, easy implement,...

Is it possible to achieve thermal radiation excited by surface waves having a coherence length much larger than what one might anticipate from the behavior of on flat interface? We demonstrate an extraordinary coherent coupled resonant cavities; each them supports standing wave polaritons. The coupling is implemented between cavities. As result, spatial increased order magnitude compared with that delocalized waves.

A geometric Doppler effect manifested by a spin-split dispersion relation of thermal radiation is observed. spin-dependent splitting was obtained in structure consisting coupled antenna array. The due to spin-orbit interaction resulting from the dynamics surface waves propagating along whose local anisotropy axis rotated space. observation spin-symmetry breaking may be utilized for manipulation spontaneous or stimulated emission.

We demonstrate the generation of far-field propagating optical beams with a desired orbital angular momentum by using smooth optical-mode transformation between plasmonic vortex and free-space Laguerre-Gaussian modes. This is obtained means an adiabatically tapered gold tip surrounded spiral slit. The proposed physical model, backed up numerical study, brings about optimized structure that fabricated highly reproducible secondary electron lithography technique. Optical measurements...

Optical beams carrying orbital angular momentum (OAM) can find tremendous applications in several fields. In order to apply these particular photonic integrated devices innovative optical elements have been proposed. Here we are interested the generation of OAM-carrying at nanoscale level. We design and experimentally demonstrate a plasmonic vortex emitter, based on metal-insulator-metal holey lens. Our element is shown convert impinging circularly polarized light an state capable...

In high temperature and vacuum applications, when heat transfer is predominantly by radiation, the material’s surface texture of substantial importance. Several micro- nanostructure designs have been proposed to enhance a emissivity its radiative coherence, as control thermal emission crucial concern in design infrared sources, optical filters, sensing devices. this research, an extraordinary coherent from anisotropic microstructure experimentally theoretically presented. The enhanced...

A wave-front phase dislocation due to the scattering of surface plasmons from a topological defect is directly measured in near field by means interference. The strength shown be equal incident optical spin with analogy magnetic flux parameter Aharonov-Bohm effect.

Surface plasmon waves carry an intrinsic transverse spin, which is locked to its propagation direction. Apparently, when a singular plasmonic mode guided on conic surface this spin-locking may lead strong circular polarization of the far-field emission. Specifically, vortex excited flat metal propagates adiabatically tapered gold nanocone where accelerates and finally beams out from tip apex. The helicity beam shown be single-handed stems solely helical wave-front. We present simple...

Recent advances in nanotechnology have prompted the need for tools to accurately and noninvasively manipulate individual nano-objects. Among possible strategies, optical forces been widely used enable nano-optical tweezers capable of trapping or moving a specimen with unprecedented accuracy. Here, we propose an architecture consisting nanotip excited plasmonic vortex enabling effective dynamic control nanoparticles three dimensions. The structure illuminated by beam angular momentum can...

Spin-orbit interaction resulting from spatial polarization state manipulation is demonstrated. Polarization-state achieved by utilizing the effective birefringent nature of subwavelength structures acting as an anisotropic inhomogeneous medium. Experimental verification obtained measuring effect unavoidable spin-dependent Pancharatnam-Berry phase modulation on far-field diffraction pattern beam. Unlike usual dynamic spin-orbit that splits spin states in temporal frequency (energy) domain,...

A method for polarimetric measurement that uses a discrete space-variant subwavelength dielectric grating is presented. One retrieves the polarization state by measuring far-field intensity of beam emerging from followed polarizer. The analysis partially polarized, quasi-monochromatic performed use coherence matrix along with an extended van Cittert-Zernike theorem. We experimentally demonstrate measurements both fully and polarized light.

The excitation of surface plasmons on an elliptical grating followed by the transmission through a subwavelength aperture can modify polarization state incoming light. combined effect grooves and slightly central hole allows to fully control birefringence retardation structure, providing simple approach for design geometry structure. From this combination, perfect plasmonic quarter-wave plate is obtained.

come from teaching and research institutions in France or abroad, public private centers.L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques niveau recherche, publiés ou non, émanant des établissements d'enseignement recherche français étrangers, laboratoires publics privés.

We study the role of optical momenta in surface plasmon excitation by topological bi-gratings. analyze plasmonic structures composed rectangular apertures rotating 2D space with given rates, which couple to specific trajectories. experimentally demonstrate control propagation through premeditated design gratings, interact linear, spin, and orbital angular momentum light. show that these trajectories can be selected purely modulation numerous degrees freedom for a structure geometry....

We theoretically investigate the generation of far-field propagating optical beams with a desired orbital angular momentum by using an archetypical magnetoplasmonic tip surrounded gold spiral slit. The use magnetic material can lead to important implications once magneto-optical activity is activated through application external field. physical model and numerical study presented here introduce concept magnetically tunable plasmonic vortex lens, namely which ensures selectivity in...

The phenomenon of coupling between light and surface plasmon polaritons requires specific momentum matching conditions. In the case a single scattering object on metallic surface, such as nanoparticle or nanohole, broadband effect, i.e., scattering, discrete one, excitation, leads to Fano-like resonance lineshapes. necessary phase requirements can be used engineer light–plasmon achieve directional plasmonic excitation. Here, we investigate this effect by using chiral nanotip excite plasmons...

In high temperature and vacuum applications, for which heat transfer is predominantly by radiation, the material’s surface texture of substantial importance. Several micro nanostructures designs have been proposed to enhance a emissivity its radiative coherence. Control thermal emission crucial concern in design infrared sources, electronic chip coolants, high-efficiency photovoltaic cells, solar energy conversion. this review paper, we present microscale nanoscale structures supporting...

Abstract Nanophotonic circuitry requires an ability to externally control and analyze optical signals tightly confined in subwavelength volumes. Various schemes of surface plasmon (SP) routing have been presented using active passive metasurfaces. One the most appealing approaches is use plasmonic spin-orbit interaction where incident light spin state efficiently coupled orbital degree freedom wave. Recently, a major attention has drawn additional - transverse some application for near-field...

Multiple vortices with different topological charges are formed by the use of two sequential geometric phase elements. These elements realized quasi-periodic subwavelength gratings. The first element is a spiral and second spherical element. We provide theoretical analysis an experimental demonstration formation multiple that comprise scalar vectorial vortex.