Collective excitation of periodic arrays metallic nanoparticles by coupling localized surface plasmon resonances to grazing diffraction orders leads lattice with narrow line width. These may find numerous applications in optical sensing and information processing. Here, a new degree freedom is experimentally investigated demonstrating handedness-dependent chiral plasmonic crescents. The self-assembly particles used as mask modified colloidal lithography applied produce planar 3D gold...

A spherical nanoparticle can scatter tightly focused optical beams in a spin-segmented manner, meaning that the far field of scattered light exhibits laterally separated left- and right-handed circularly polarized components. This effect, commonly referred to as giant spin Hall effect light, strongly depends on position scatterer focal volume. Here, scheme utilizes an weak measurement cylindrical polarization basis is put forward drastically enhance spin-segmentation and, therefore,...

Spin-orbit interactions in optics traditionally describe an influence of the polarization degree freedom light on its spatial properties. The most prominent example is generation a spin-dependent optical vortex upon focusing or scattering circularly polarized plane-wave by nanoparticle, converting spin to orbital angular momentum light. Here, we present mechanism conversion orbital-to-spin linearly beam spherical silicon nanoparticle. We show that focused Laguerre-Gaussian beams first order...

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.

Observation of spin-dependent plasmonics based on the interference topological defects in near-field is presented. We utilize surface plasmons' scattering dynamics from localized vortex sources to create spinoptical devices as an ensemble isolated nanoantennas observe a "giant" plasmonic and focusing lens. The spin-orbit point spread function, spiral wavefront, introduced, where optical spin degree freedom.

Abstract The optical conversion of incoherent solar radiation into a bright, coherent laser beam enables the application nonlinear optics to energy and storage. Here, we present an architecture for pumped lasers that uses luminescent concentrator decouple conventional trade-off between absorption efficiency mode volume gain material. We report 750-μm-thick Nd 3+ -doped YAG planar waveguide sensitized by CdSe/CdZnS (core/shell) colloidal nanocrystal, yielding peak cascade transfer 14%, broad...

Controlling the polarization state and propagation direction of photons is a fundamental prerequisite for many nanophotonic devices precursor future on-chip communication, where emission properties individual emitters are particularly relevant. Here, we report on partially circularly polarized by linear dipole. The underlying effect linked to near-field part angular spectrum dipole, it occurs in any type dipole emitter, ranging from atoms quantum dots molecules dipole-like antennas. We...

We experimentally investigate the chiral optical response of an individual nanostructure consisting three equally sized spherical nanoparticles made different materials and arranged in 90° bent geometry. Placing on a substrate converts its morphology from achiral to chiral. Chirality leads pronounced differential extinction (circular dichroism) rotation birefringence), which would be strictly forbidden absence or heterogeneity. This first experimental observation substrate-induced break...

In this paper, the authors clarify physical significance of two types chirality that occur in optical beams, namely geometrical (determined by spatial distribution beam) and (given local handedness electromagnetic field vectors). An experiment shows how couple to each other.

Structured illumination allows for satisfying the first Kerker condition of in-phase perpendicular electric and magnetic dipole moments in any isotropic scatterer that supports resonances. The induced Huygens' may be utilized unidirectional coupling to waveguide modes propagate transverse excitation beam. We study two configurations a dipole, longitudinal or vice versa. experimentally show only radially polarized emission azimuthally second configuration are directional far field. This...

Abstract Chiral plasmonic nanostructures hold promise for enhanced chiral sensing and circular dichroism spectroscopy of molecules. It is therefore interest to fabricate with tailored chiroptical properties over large areas reasonable effort. Here, a colloidal lithography approach used produce macroscopic arrays sub‐micrometer 3D crescent structures >1 cm 2 . The chirality originates from symmetry breaking by the introduction step within structure. This produced an intermediate layer...

We experimentally demonstrate the emergence of a purely azimuthally polarized vectorial vortex beam with phase singularity upon Brewster reflection focused circularly light from dielectric substrate. The effect originates polarizing properties Fresnel coefficients described in Brewster's law. An astonishing consequence this is that reflected field's Cartesian components acquire local singularities at angle. Our observations are crucial for polarization microscopy and open new avenues...

Abstract Broadband light sources are a wide class of pumping schemes for lasers including LEDs, sunlight and flash lamps. Recently, efficient coupling broadband to high-quality micro-cavities has been demonstrated on-chip applications low-threshold solar-pumped via cascade energy transfer. However, the conversion incoherent coherent comes with an inherent price reduced efficiency, which yet be assessed. In this paper, we derive detailed balance limit efficiency broadband-pumped discuss how...

We investigate points of circular polarization in the far field elliptically polarized dipoles and establish a relation between angular position helicity these $C$ dipole moment. In case highly eccentric dipoles, opposite handedness exhibit only small separation occur low intensity region emission pattern. this regard, we introduce an optical weak measurement approach that utilizes transverse electric (azimuthal) magnetic (radial) far-field basis. Projecting onto spatially varying...

Chiral light-matter interactions are at the heart of countless phenomena and applications. Here, authors demonstrate how electric-dipole scatterers can mimic light chiral matter. The underlying mechanism originates from selective response to incident electric field only, lack reflection symmetry whole experiment. These results address fundamentals duality in optics interactions, accentuating their richness ubiquity even highly symmetric scenarios.

Light can carry both spin and orbital angular momentum. While it is known that a nonparaxial circularly polarized beam couples the momentum to momentum, this phenomenon does not hold upon collimation of field. With rising interest in epsilon-near-zero photonics, integral ingredients field are beam-shaping capabilities such regime. In work, experimentally shown permanent conversion spin-to-orbital arises naturally from an incident on isotropic interface due asymmetry Fresnel coefficients....

We experimentally investigate the behavior of Fano-like plasmonic resonance lineshape in a simple system comprising subwavelength hole or particle illuminated by tightly focused Gaussian beam. observe that for small lateral displacement scatterer, k-space distribution wave exhibits strong spin-dependent azimuthal variation. attribute this phenomenon to sensitive light-plasmon coupling conditions arising due specific phase matching requirements. This effect is qualitatively described...

Abstract Chiroptical effects arising in mirror‐symmetric geometrically achiral resonant heterostructures are investigated. It is shown that coalescence of extrinsic chirality, heterogeneous morphology, and substrate‐induced break symmetry leads to pronounced circular dichroism birefringence. The physics the involved phenomena elucidated by studying spin‐splitting scattering hybridized dipolar modes a heterodimer made gold silicon nanoparticles same shape size. work sheds new light on optical...

Deep subwavelength localization and displacement sensing of optical nanoantennas have emerged as extensively pursued objectives in nanometrology, where focused beams serve high-precision rulers while the scattered light provides an readout. Here, we show that these schemes using excitation a position gauge implies sensitivity to displacements nanoantenna depends on spatial gradients field. Specifically, explore one such novel based appearance transversely spinning fields strongly confined...

Abstract High-quality micro-lasers are key ingredients in non-linear optics, communication, sensing and low-threshold solar-pumped lasers. However, such exhibit negligible absorption of free-space broadband pump light. Recently, this limitation was lifted by cascade energy transfer, which the quality factor modulated with wavelength, enabling non-resonant pumping high-quality laser to operate at record low solar concentration. Here, we present a generic theoretical framework for modeling...

We observe an unusual polarization state conversion in the light that passes through a cylindrical hole thick metal film. This phenomenon is related to helicity locking of guided mode due plasmonic transverse spin—an intrinsic angular momentum surface waves. show how this effect linked generation vortex inside and can be altered by varying diameter. In addition, total transmission shown partially contributed from direct transmission, which further modify resulting state.

We present a novel approach for GaAs-based DBR diode lasers with an extended cavity. The developed chips exhibit record small 3 dB linewidth of 25 kHz @ 1 ms at the wavelength 1064 nm.

We demonstrate efficient incoherent pumping for high-Q micro-laser. implement this concept in organic and Nd:YAG micro-lasers to deliver fully integrated on-chip coherent light source solar-powered laser that doesn't require tracking the sun.

We report a novel solar pumped laser configuration that provides efficient pumping scheme by sunlight. Laser is achieved above threshold of 150 suns. This opens the way for energy transfer and nonlinear-optics in photovoltaics.