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We present a 10-channel slotted single-mode laser array with effective-cavity-length ∼300µm which exhibits quasi-continuous tuning range ∼31nm over 42°C with side-mode suppression-ratio >35dB. The linewidth is about 2MHz for all channels at 150mA at 20°C.
We introduce a helix-based metamaterial, a circular polarization converter, composed of pairs of oppositely-handed helices on a square array. We compare our theoretical findings to measurements on samples made by laser lithography and electroplating.
We demonstrate an on-chip optical phased array fabricated in a CMOS compatible process with continuous, fast (100 kHz), wide-angle (51o) beam-steering that is suitable for applications such as low-cost lidar systems.
We present a novel bilayer plasmonic nanoantenna array, utilizing lattice plasmon waves to increase the sensitivity in SERS process. Using this nanostructure, we performed SERS measurements of proteins in a very low concentration.
We experimentally realize a patterned hyperbolic metafilm with engineered and freely tunable absorption band from near-IR to mid-IR spectral regions based on multilayered metal/dielectric hyperbolic metamaterial waveguide taper.
We demonstrate theoretically and experimentally the Rashba effect using light in two “counterpropagating” photonic lattices. We observe breaking of inversion symmetry in the resulting band structure.
We introduce a new perfect state transfer protocol based on single-photon W-eigenstates of photonic lattices. Such W-eigenstates appear as impulse response of the system, e.g., when single photons are launched into single sites.
We demonstrate single-shot, two-dimensional imaging of ultrafast phenomena using a streak camera and a tilted lenslet array. We derive conditions for parallax-free imaging and experimentally verify the geometry by observing scattering of femtosecond pulses.
We demonstrate a liquid metal-based reconfigurable terahertz metamaterial device that is not only pressure driven, but also exhibits pressure memory. The discrete response is obtained by injecting eutectic gallium indium into a microfluidic structure.
Todays terahertz instrumentation lacks cost-effective sources and detectors compatible with standard microelectronics to drive down the system cost. This paper presents recent developments based on silicon process technologies and discusses the challenges in implementing source and detectors. It presents a 530 GHz source array with up to 1 mW radiated power, a 1024-pixel CMOS camera, and a heterodyne...
We demonstrate for the first time the assembly of an array of gold particles using a guided-resonance mode of a photonic-crystal slab. The 200nm diameter particles form a triangular lattice with spacing of 1140 nm and exhibit high stability.
V-shaped air slits inscribed in a metallic thin film is used to achieve cross-polarized anomalous refraction with high efficiency. The experimental refraction angles are in excellent agreements with theoretical values.
We report single-photon emission from electrically driven site-controlled InGaN/GaN dot-in-nanowires, fabricated from a planar single InGaN quantum well LED using a top-down approach. Each dot-in-nanowire's formation site, diameter, height and material compositions were precisely controlled.
We demonstrate the robustness of topological edge states in a photonic system of coupled microring resonators. Using direct imaging and transmission analysis, we show that the edge states are robust to lattice disorders.
Phase locking, via resonant leaky-wave coupling, of five 8.36 µm-emitting quantum cascade lasers has provided in-phase-mode operation to 3 W with 1.5 × diffraction limit lobe-width and 2.45 W emitted in the main far-field lobe.
By incorporating two-dimensional photonic crystals into the surface of InGaN-based LEDs, the strong correlation between the air duty cycle and the light extraction efficiency of LEDs was demonstrated by optical and electrical measurement results.
In this work, we theoretically and numerically demonstrate several new plasma filament-based structures used for increasing the angular and range resolution of microwave radar systems, and show that they can survive in adverse environments.
We propose the photonic topological Anderson insulator (FTAI), the first realization of the FTAI phase in any physical context (including condensed matter and cold atoms). In this phase, disorder counterintuitively induces a topological transition that breaks Anderson localization and leads to robust transport.
The photo-induced collective heating enabled by a plasmonic nanoantenna array is for the first time harnessed for rapid concentration, manipulation and sorting of particles, with high throughput. This work could find application in biosensing, and surface enhanced spectroscopies.
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