(Color) Schematic view of the subwavelength metallic slits supporting multiple subwavelength guided modes.
(Color) (a) Transmission spectrum of a TM-polarized electromagnetic wave through a periodic array of subwavelength metallic slits (h = 1.2d and a = 0.1d, 0.5d) on a dielectric substrate, showing multiple guided modes. Silicon and silicon dioxide are used as the slit and substrate dielectrics. Perfect metals with infinite permittivity are used in this analysis to keep the generality of our theoretical model (Eq. (15)) at an arbitrary wavelength. Color map of the electric field density of a TM-polarized electromagnetic wave interacting with the periodic array of subwavelength metallic slits (h = 1.2d and a = 0.1d) at the 1st, 2nd, 3rd, and 4th guided mode wavelengths supported by the metallic slits, as in (b), (c), (d), and (e). The electric field distribution profiles correspond to the TEM modes supported by the subwavelength slab waveguides formed by the periodic array of metallic slits. Comsol multiphysics package is used to calculate the electric field density of each guided mode.
(Color) Periodic arrays of metallic nanoslits designed to efficiently couple terahertz and optical electromagnetic waves into the nanoscale In0.53Ga0.47As semiconductor regions, and the transmitted power into the nanoscale semiconductor regions calculated by the presented theoretical analysis (red curve) and the finite element method (blue curve).
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