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We will review our works on plasmon lasers and circuits. The scaling down of laser will experience ever-increasing radiation loss and stronger divergence. Plasmonics has emerged as one solution for these hurdles.
We report plasmon lasers with strong cavity feedback and optical confinement to 1/20th wavelength. Strong feedback arises from total internal reflection of plasmons, while confinement enhances the spontaneous emission rate by up to 20 times.
We review recent progress on metal-based lasers with optical confinement approaching 1/20th of the wavelength at room temperature and discusses the broader impact of plasmonic light sources and their application.
We report plasmonic Fabry-Perot nano-cavities formed by high aspect ratio metal mirrors on a metal surface. Quality factors from 100-200 were obtained, limited by plasmonic losses and fin scattering at short and long wavelengths respectively.
We report the first bulk metamaterials at visible frequencies that shows intriguing negative refraction for all incident angles. The metamaterial is realized by growing silver nanowire in a porous alumina template.
We experimentally demonstrate cloaking at optical frequencies. A dielectric carpet cloak is designed to hide object under a curved reflecting surface by mimicking the reflection from a flat surface, enabling broadband invisibility with low loss.
We present the formulation of wave propagation in arrays of subwavelength waveguides with sharp index contrasts. We demonstrate the collapse of the bands into evanescent modes, and propagation of lattice solitons with superluminal phase velocity.
We present linear and nonlinear deep sub-wavelength confinement in metal-dielectric periodic nano-structures. The strong anisotropy supports the propagation of modes with very large transverse momentum, enabling confinement size limited only by the structure periodicity.
We present the formulation of wave propagation in arrays of subwavelength waveguides with sharp index contrasts. We demonstrate the collapse of the bands into evanescent modes, and propagation of lattice solitons with superluminal phase velocity.
We predict and present the first observation of conical diffraction arising from k-space singularities in the band-structure of a periodic potential. The experiments are carried out in honeycomb lattices, where we also generate ??honeycomb gap-solitons??.
We present a new approach for the study of light propagation in 2-dimensional disordered lattices. We demonstrate experimentally diffusion-like transport and show by numerical study that our method can provide direct observation of Anderson Localization.
We present the first experimental observation of spatial four-wave-mixing in photonic lattices, demonstrating universal aspects associated such processes in periodic media, such as Bloch-wave folding, engineered phase-matching, and ldquoband-controlrdquo of the interaction products.
We present the first observation of defect dynamics in 2D nonlinearly interacting photonic quasicrystals. In addition, we present experiments showing linear ldquodiscreterdquo diffraction from various lattice sites and lattice solitons in photonic quasicrystals.
We report the first experimental observation of gap random-phase lattice solitons. We observe their self-trapping conformed to the lattice periodicity in real space, as well as their multi-humped power spectrum in k-space.
We show that two Bloch modes launched into a nonlinear photonic lattice can evolve into a supercontinuum of spatial frequencies, exhibiting a sensitive dependence on the momentum difference of the two initially excited modes.
Electroholographic switches in which the applied field is perpendicular to the grating vector so that the Bragg condition is electrically tuned are presented. Tunability of 7 nm can be accomplished in a single grating.
We introduce a novel experimental technique: imaging the Fourier power spectra of beams propagating in nonlinear photonic lattices. As applications, we present Brillouin zone spectroscopy and a direct observation of nonlinear energy transfer in k-space
We present the experimental observation of both on-site and off-site vortex ring solitons of unity topological charge in a nonlinear photonic lattice, along with a theoretical study of their propagation dynamics and stability
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