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We study extraordinary optical transmission by placing a metal screen with a 1-D array of holes inside a parallel-plate waveguide at terahertz frequencies. We find excitation with TE1 or TEM mode strongly affects output transmission characteristics.
We propose an achromatic wave plate in the high THz frequency region based on the artificial medium. It is composed of the stacked parallel metal plates with a pillar array, which bring in the controllable birefringence in an effectively lossless medium. We experimentally demonstrate that the artificial medium operates as the quarter wave plate from 2.05 to 3.26 THz.
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 present a polarization beam splitter with a metal nanorods array embedded between two silicon waveguides. Localized surface plasmon resonance of the metal array introduces the birefringence with short coupling length and broad bandwidth.
We apply an analytical procedure that uses a periodic Green's function based on the Ewald representation to compute the modes in a linear chain of plasmonic nanospheres, including the case of complex modal wave numbers. We analyze both transverse and longitudinal polarizations (with respect to the array axis) of the nanospheres' electric dipole moments. Among all the modes, we discuss those excitable...
We propose and experimentally demonstrate nano-antenna emitters coupled to a dielectric waveguide. Initial measured emitter efficiencies are 4.9–13% with simulations predicting > 50% efficiencies with bandwidths exceeding 300nm in more advanced and ideally fabricated geometries.
We present the design and analysis of subwavelength lenses based on air cylindrical waveguides surrounded by metal for the focusing of light in very small areas. The lenses are composed by several concentrically disposed air-metal waveguides with different widths in order to control the phase shifting necessary to focus the light. The lenses we designed to operate at visible frequencies then, the...
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