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We present a theoretical and numerical framework to analyze optical properties of subwavelength apertures that are distributed arbitrarily on the 2-D plane of a metal film. Using the radiation patterns linked to individual eigenmodes inside the aperture, the coupling between multiple apertures is described efficiently by a small-rank linear system of equations. The complicated contributions from both...
We demonstrate dispersion control of near-infrared surface plasmon polariton by tuning the filling fraction of a multilayer metallo-dielectric hyperbolic metamaterial. We show that effective medium approximation accurately provides the dispersion behavior for a structure with only 2.5 periods.
We rigorously determine the effect of parasitic loss on the achievable absorption enhancement in nanophotonic, plasmonic light trapping schemes. We show that, even in the presence of parasitic loss, opportunities exist to exceed conventional limits.
Nearly perfect 90-degree bends and T-splitters are demonstrated in plasmonic nano-coaxial waveguides at the telecommunication wavelength, with bending and splitting efficiencies greater than 97% and 99%, respectively.
We show that high spectral sensitivity in surface plasmon resonance sensor is due to the multi-mode nature of the sensing scheme. Multi-mode sensing can be applied to dielectric systems to achieve similar extraordinary spectral sensitivity.
The optical properties of nanoscale apertures in optically thick metallic films have been intensely researched in the past years due to their fundamental importance in near-field optics. Here, we show that the entire dispersion behavior of a plasmonic structure with coaxial cross-section i.e., formed by a dielectric ring between a metallic core and a metallic cladding, is well-approximated by a simple...
We analyze propagating plasmonic modes in deep-subwavelength coaxial metallic waveguides with a hollow core. Such modes couple to plane waves and exhibit much larger cutoff wavelengths than the TE11-mode in a conventional coaxial waveguide.
We demonstrate the existence of a bound optical mode supported by a slot in a thin metallic film deposited on a substrate, with slot dimensions much smaller than the wavelength.
Metal-dielectric-metal structures support propagating electromagnetic modes that are strongly confined in the dielectric region. These modes can be used to create omni-directional absorbers, sub-wavelength waveguides, negative refraction lens, and high-dielectric-constant meta-materials
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