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We use a semi-classical approach to model interaction of light wave with media and phenomenological approach to describe spontaneous emission that feeds the lasing modes to study a hyperbolic metamaterial coated with different gain materials.
Hyperbolic metamaterials possess unique optical properties owing to their hyperbolic dispersion. As hyperbolic metamaterials can be constructed just from periodic multilayers of metals and dielectrics, they have attracted considerable attention in the nanophotonics community. Here, we review some of our recent works and demonstrate the benefits of using hyperbolic metamaterials in plasmonic waveguides...
Total ionizing dose effects on carbon nanotube network transistors were experimentally evaluated using 60Co gamma-ray irradiation up to 50 kGy(Si). The electrical characteristic of the devices after irradiation are reported for future space applications.
We study the properties of plasmonic waveguides with a dielectric core and multilayer metal-dielectric claddings that possess hyperbolic dispersion. The waveguides hyperbolic multilayer claddings show better performance in comparison to conventional plasmonic waveguides.
We show with experiments that localized surface plasmon resonances in conductive nitride nanoparticles result in broadband light absorption covering solar spectrum. The nitride nanoparticle dispersed water was warmed and generated vapor efficiently by sunlight illumination.
We report on the fabrication of large-area aluminum plasmonic perfect absorber (Al-PA) using colloidal lithography combined with reactive ion etching process. Using the Al-PA, we demonstrate selective thermal emitters and tailor-made molecular vibrational sensing.
The surface plasmon resonances of titanium nitride nanoparticles are broad and covers majority of the solar spectrum. In terms of integrated absorption efficiency titanium nitride nanoparticles are efficient sunlight absorbers due to these resonances, even better than gold and carbon nanoparticles which have been extensively studied so far. In experiment, titanium nitride nanoparticles were dispersed...
We experimentally demonstrate that a single metallic contact attached to an optical waveguide can electrically detect near-infrared light guided through the waveguide. The device consists of a metal-insulator-metal structure, where hot carriers are generated at the thin metal films. This simple and compact structure allows our device to be integrated to any type of optical waveguide to monitor the...
The control of phase plays a fundamental role in wave propagation. Metasurfaces (thin metamaterial layers) can introduce an additional spatially non-uniform phase in the incoming wave, thereby affecting its propagating characteristics. A metasurface consisting a plasmonic nano-antenna array can introduce an abrupt phase discontinuity at the interface and therefore have unparalleled wave-front control...
We demonstrate that non-locality can induce a new type of optical topological transition in photonic metamaterials. We describe the corresponding critical state and analyze the optical properties of such media.
Experiments demonstrate that inside strongly anisotropic materials with hyperbolic dispersion, light diffracted from double slits propagates as volume plasmon polaritons and form subwavelength interference peaks that can be used in subwavelength photolithography and probes.
We present new types of focusing devices consisting of metallic nanoslits with proof-of-concept experiments. Polarization-selective nanoslit lenses can focus or defocus linearly polarized light depending on the incident polarization. The interference peak from double slits inside a strongly anisotropic medium becomes sub-wavelength. We also present our work on scattering from a strongly anisotropic...
It is experimentally demonstrated that subwavelength holes milled in a metallic film as a set of concentric circular rings can focus linearly polarized light in the visible range.
We experimentally demonstrate a phase hologram generated at a visible wavelength by a plasmonic metasurface consisting of Babinet-inverted nano-antennas perforated on a 30-nm-thick gold film. Micrometer-sized planar lenses are made with the same technique.
The dispersion relations of multilayer dye-doped hyperbolic metamaterials (HMM) are studied. We show that metallic losses can be greatly compensated by saturated gain. Two realizable applications using gain-assisted HMMs, namely hypergratings and epsilon-near-zero materials, are proposed.
Our experiment demonstrates a subwavelength-wide peak from double-slit diffraction inside a slab with hyperbolic dispersion; this highly localized field can be used for subwavelength probes.
We experimentally demonstrate the focusing properties of arrays of parallel subwavelength-wide nanoslits in a gold film. The lenses are designed to focus either TM- or TE-polarized light and diverge the light of the orthogonal polarization.
A modified definition of the stretching factor for perfectly matched layer is introduced in 2D finite difference time domain method. This modified definition allows us to write equations for only one polarization to calculate both TMz and TEz polarized fields by taking the advantage of duality relations. The wave incident at Brewster angle and wave propagation through Fresnel zone plate are simulated...
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