A. V. Kildishev

Simplified model for periodic nanoantennae: linear model and inverse design

We determine and use a minimal set of numerical simulations to create a simplified model for the spectral response of nanoantennae with respect to their geometric and modeling parameters. The simplified model is then used to rapidly obtain best-fit modeling parameters to match experimental results, accurately predict the spectral response for various geometries, and inversely design antennae to have a desired performance. This method is structure and model independent, and is applied here to both nanoantenna pair arrays and strips modeled using a 3D finite-element method and 2D spatial harmonic analysis, respectively. Typical numerical simulations may need hours per model, whereas this method, after the initial time to obtain a baseline set of simulations, requires only seconds to analyze and generate spectra for new geometries.

Characterizing NL response of metal-dielectric metasurfaces

A method for retrieving effective n2 and α from bianistropic parameters of non-linear metasurfaces is introduced. The effective nonlinear parameters of a metasurface covered by a NL layer are compared vs a bare NL layer.

Enhancement of Single-Photon Sources with Metamaterials

M. Y. Shalaginov, S. Bogdanov, V. V. Vorobyov, A. S. Lagutchev, A. V. Kildishev, A. V. Akimov, A. Boltasseva, and V. M. Shalaev1,∗ School of Electrical and Computer Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907, USA, Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region,141700, Russia Russian Quantum Center, Skolkovo Innovation Center, Moscow Region, 143025, Russia Lebedev Physical Institute RAS, Moscow, 119991, Russia

Optical characteristics of vertically aligned arrays of branched silver nanowires

Vertically aligned branched silver nanowires (Ag BNWs) were synthesized by electrodeposition. Typically, branched NWs seen in literature do not have vertical alignment of the branches, as opposed to the results shown here. A wavelength dependent absorption of these Ag BNWs was demonstrated in this work. The strong wavelength dependence of the reflectance and transmittance of these Ag BNWs may be attributed to the wave-guiding effect of the nanostructures.

Patterning metamaterials for fast and efficient single-photon sources

Solid state quantum emitters are prime candidates to realize fast on-demand single-photon sources. The improvement in photon emission and collection efficiencies for quantum emitters, such as nitrogen-vacancy (NV) centers in diamond, can be achieved by using a near-field coupling to nanophotonic structures. Plasmonic metamaterial structures with hyperbolic dispersion have been previously demonstrated to significantly increase the fluorescence decay rates from NV centers. However, the electromagnetic waves propagating inside the metamaterial must be outcoupled before they succumb to ohmic losses. We propose a nano-grooved hyperbolic metamaterial that improves the collection efficiency from a nanodiamond-based NV center by a factor of 4.3 compared to the case of coupling to a flat metamaterial. Our design can be utilized to achieve highly efficient and fast single-photon sources based on a variety of quantum emitters.

Patterned multilayer metamaterial for fast and efficient photon collection from dipolar emitters

Solid-state quantum emitters are prime candidates for the realization of fast, on-demand single-photon sources. The improvement in photon emission rate and collection efficiency for point-like emitters can be achieved by using a near-field coupling to nanophotonic structures. Plasmonic metamaterials with hyperbolic dispersion have previously been demonstrated to significantly increase the fluorescence decay rates from dipolar emitters due to a large broadband density of plasmonic modes supported by such metamaterials. However, the emission coupled to the plasmonic modes must then be outcoupled into the far field before it succumbs to ohmic losses. We propose a nano-grooved hyperbolic metamaterial that improves the collection efficiency by several times compared to a conventional planar lamellar hyperbolic metamaterial. Our approach can be utilized to achieve broadband enhancement of emission for diverse types of quantum emitters.

Hyperbolic Metamaterials for Single-Photon Sources and Nanolasers

Hyperbolic metamaterials are anisotropic media that behave as metals or as dielectrics depending on light polarization. These plasmonic materials constitute a versatile platform for promoting both spontaneous and stimulated emission for a broad range of emitter wavelengths. We analyze experimental realizations of a single–photon source and of a plasmonic laser based on two different architectures of hyperbolic metamaterials. At the heart of this material capability lies the high broadband photonic density of states originating from a rich structure of confined plasmonic modes.

Transformation Optics with Metamaterials: A New Paradigm for Science of Light

Optical metamaterials designed for extreme control over the flow of light at both the nano- and macroscopic scales are discussed. These extreme metamaterials incorporate the innovative theories of transformation optics (TO).

Optical Negative-Index Metamaterials: from low to no-loss and from linear to nonlinear optics

Calculations show that matched impedance and compensated losses due to optimized design and gain material, respectively, can lead to 100% transmission. Extraordinary nonlinear-optical properties originating from contra-directed wave and Poynting vectors are discussed.