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Weyl point is a topological singular point in the momentum space. There are two types of Weyl points, type-I and type-II, both are topologically nontrivial but exhibit very different physical properties. For instance, the density of state is zero at a type-I Weyl point; while that of type-II Weyl point is rather large just like the hyperbolic metamaterials. Up to now, there has not been any exploration...
We introduce general principles for maximally violating detailed balance in thermal radiation. We validate these principles by direct calculations, based on fluctuational electrodynamics, on thermal emitters constructed from magneto-optical photonic crystals.
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 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 present a novel efficient model to analyze the optical properties of multiple subwavelength apertures arbitrarily located on metal films. The model is verified by computing extraordinary optical transmission through an aperiodic nanoslit array.
We optimize the optical properties of nano-patterned metallic films for use as transparent conductive electrodes in optoelectronic devices by performing a constant-sheet-resistance transformation. Our design principles apply to both one- and two-dimensionally patterned films.
We present a temporal coupled-mode theory for the Fano resonance in light scattering by individual obstacle. As an application, we design a structure that exhibits strong absorption and weak scattering properties at the same frequency.
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.
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