The ability of light to carry and deliver orbital angular momentum (OAM) in the form optical vortices has attracted much interest. physical properties with a helical wavefront can be confined onto two-dimensional surfaces subwavelength dimensions plasmonic vortices, opening avenues for thus far unknown light-matter interactions. Because their extreme rotational velocity, ultrafast dynamics such remained unexplored. Here we show detailed spatiotemporal evolution nanovortices using...

Abstract Optical computing holds significant promise of information processing with ultrahigh speed and low power consumption. Recent developments in nanophotonic structures have generated renewed interests due to the prospects performing analog optical compact devices. As one prominent example, spatial differentiation has been demonstrated directly applied for edge detection image processing. However, broadband isotropic two-dimensional differentiation, which is required most imaging...

We analyze scattering properties of twisted bilayer photonic crystal slabs through a high-dimensional plane wave expansion method. The method is applicable for arbitrary twist angles and does not suffer from the limitations commonly used supercell approximation. show strongly tunable resonance this system which can be accounted semianalytically correspondence relation to simpler structure. also observe resonant chiral behavior in system. Our work provides theoretical foundation predicting...

One of the basic functionalities photonic devices is ability to manipulate polarization state light. Polarization components are usually implemented using retardation effect in natural birefringent crystals and, thus, have a bulky design. Here, we demonstrated manipulation light by employing thin subwavelength slab metamaterial with an extremely anisotropic effective permittivity tensor. properties incident on regime hyperbolic, epsilon-near-zero, and conventional elliptic dispersions were...

We designed and realized a metasurface (manipulating the local geometry) spiral global plasmonic lens, which fundamentally overcomes multiple efficiency functionality challenges of conventional in-plane lenses. The combination spirality achieves much more efficient uniform linear-polarization-independent focusing. As for functionality, under matched circularly polarized illumination lens directs all power coupled to surface plasmon polaritons (SPPs) into focal spot, while orthogonal...

We demonstrate nanofocusing down to 60 nm with 800-nm light in atomically flat single-crystalline 22-nm-thick gold flakes.

Light can exert forces on objects, promising to propel a meter-scale lightsail near the speed of light. The key address many challenges in such an ambition hinges nanostructuring lightsails tailor their optical scattering properties. In this Letter, we present comprehensive study photonic design by applying large-scale optimization techniques generic geometry based stacked crystal layers. is performed rigorous coupled-wave analysis amended with automatic differentiation methods for...

Abstract We propose the generation of 3D linear light bullets propagating in free space using a single passive nonlocal optical surface. The nanophotonics can generate space–time coupling without any need for bulky pulse-shaping and spatial modulation techniques. Our approach provides simultaneous control various properties bullets, including external such as group velocity propagation distance, internal degrees freedom spin angular momentum orbital momentum.

In the past decade, optical orbital angular momentum (OAM) has entered field of plasmonics in form surface-confined vortices, generating vast interest. Here we give an overview field, starting with pioneering analytic and experimental investigations plasmonic OAM. We describe advances leading to study suboptical cycle dynamics time-resolved experiments investigation light–matter interactions through mixing circularly polarized light vortices. how additional degrees freedom can be controlled...

Broad-area, vertical-cavity surface-emitting lasers were shown to switch their emission mode from the regular single or multilobed light fields exhibit complex arrays of “dark beams.” Examination these dark spot revealed that they consist multiple, closely packed optical vortices: have phase singularities and show increased complexity as injection current level is raised. Contrary appearance, most distributions are not result a multimode (multiple-frequency) operation but single-frequency...

The seamless transition between microscale photonics and nanoscale plasmonics requires overpassing different waveguiding mechanisms a few orders of magnitude in the lateral dimension. Exploiting gap plasmon-polariton waves both at with an ultrashort (few micrometers) nonadiabatic tapered plasmon waveguide, we show theoretically that very high-power transfer efficiency (approximately 70%) is achieved. same mechanism may be used to harvest impinging light direct them into nanohole or slit...

Transverse mode characteristics of vertical cavity surface-emitting (VC-SE) lasers are described. The structure is investigated as a function the transverse dimension for proton-implanted gain-guided VC-SE lasers. A comparison made to an air-post index-guided structure. lasing modes and evolution with increasing drive current observed be highly analogous those edge-emitting Broad-area lase in fundamental TEM00 near threshold. At higher currents, high-order successively excited. 5 μm square...

Formation of a novel hybrid-vector spatial plasmon-soliton in Kerr slab embedded between metal plates is predicted and analyzed with modified nonlinear Schrodinger equation encompassing field characteristics. Assisted by the transverse plasmonic effect, self-trapping dimension was substantially compressed (compared dielectrically cladded case) when reducing width. The practical limitation size reduction determined available materials loss. For extreme reported values index change, we predict...

Coupling of two-dimensional (2D) vertical-cavity surface-emitting lasers (VCSELs) to give a coherent supermode is described. The top metal layer stained-layer InGaAs quantum well VCSEL structure was patterned laterally by depositing various metals with different optical reflectivities. This lateral reflectivity patterning defined 2D laser array sharing the same ‘‘supercavity’’. It shown that these arrays oscillate in stable single, supermode. achieved simple planar process and without...

Semiconductor photonics is an advanced field, both from fundamental and applicative points of view, aimed at the integration unique features optical communications quantum optics with miniaturization controllability semiconductors. Many classical applications may benefit interaction between signals, usually implemented by nonlinear processes various orders. The efficiency such in semiconductors being constantly enhanced, assisted progress ultrashort laser pulses ultra-sensitive detectors,...

Multimode multiplexing can potentially replace WDM for implementing multichannel short reach interconnects. Multiple optical modes thus be exploited as the channels transferring data, where each mode represents an independent data channel. The basic building block of system is a Mode Add/Drop which implemented based on adiabatic power transfer. We propose new scheme realization such add drop with predefined coupling profile, and demonstrate it by employing linearly decreasing coefficient...

Communications and range estimation between formation members are essential functions of flying. The inherent features laser free-space link: small weight mass, power efficiency, broadband, high precision, availability state-of-the-art components, make it a very attractive candidate for micro-satellite flying missions. A single two-way link, performing simultaneously communication spacecraft is being investigated in the framework Broadband Laser Inter-Satellite Link (BLSIL), joint...

The phase-locking of two-dimensional (2D) arrays incorporating a large number electrically pumped, vertical cavity surface emitting lasers (VCSELs) is described. InGaAs/GaAs quantum well VCSELs are phase locked by patterning the reflectivity laser back mirrors. Structures with both weak and strong modulation mirror have been studied. strongly modulated (weakly coupled) structures exhibit superior coherence beam patterns, up to 27×27 oscillating in virtually single (highest order) supermode....

Plasmonic circuit elements, which are based on complementary waveguide structures (waveguides with a dielectric core and metal cladding), becoming preferred plasmonic devices for applications. In this paper, we look into the modeling of such devices, namely 1D waveguides related elements as well 2D slots, trenches, channels supporting slow waves. Methods effective index, finite-difference time domain, finite or other full-vectorial propagation schemes among methods discussed, their...

The downscaling of conventional RF transmission lines methodologies to subwavelength plasmonic circuits is discussed and demonstrated for a lambda/4 transformer impedance matching. nano-size transformer, matching between 0.5mum 50nm wide lines, enhances the coupling efficiency by more than 285% compared direct ("end fire") - i.e. harvesting 86% total incident power. influence transverse resonances induced metal claddings input line on light as well.

We demonstrate experimentally and theoretically a broad-band enhancement of the spontaneous two-photon emission from AlGaAs at room temperature by plasmonic nanoantenna arrays fabricated on semiconductor surface. Plasmonic structures with inherently low quality factors but very small effective volumes are shown to be optimal. A 20-fold was achieved for entire antenna array, corresponding an nearly 3 orders magnitude charge carriers emitting near field antenna.

A method for designing plasmonic particles with desired resonance spectra by exploiting the interaction of local geometry surface charge distribution and applying evolutionary algorithm is presented. The based on repetitive perturbations an initial particle's shape while calculating eigenvalues various quasistatic resonances. Novel family collocated dipole–quadrupole resonances was designed, as example unique power method.

We analyze an inherent nonlinearity of surface plasmon polaritons at the interface Fermi-Dirac metal plasma, stemming from depletion electron density in high-intensity regions. The derived optical nonlinear coefficients are comparable with experimental values for metals. calculate dispersion relations propagation polaritons, predicting a nonlinearity-induced cutoff and vanishing group velocity.