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(Color) Optical transmission through a single nanoaperture (-wide single slit) formed on a metal layer (-thick silver): a FDTD analysis of beam propagation. A TM-polarized plane wave ( wavelength) is incident to the slit from the bottom side in the image.
Characteristics of a surface plasmon wave through a nanoslit structure formed in metal. (a) The complex refractive index, (the real part in a solid curve and the imaginary part in a dashed curve) calculated for a silver slit (with slit width of 40 or ). The inside of the slit region is assumed to be air. (b) The transmittance and the phase of the optical field at a nanoslit exit plotted as a function of slit depth . The slit width is assumed to be and the wavelength of light is . The dielectrics adjacent to the nanoslitted silver layer are assumed to be air.
(Color) Refractive transmission of light through a nanoslit array formed in a metal layer with tapered metal thickness. (a) A schematic drawing of a three-slit structure with tapered metal thickness. -wide slits are introduced on a layer with a spacing, and the metal thickness is varied with a step profile such that the slit depth becomes 250, 300, and in sequence. (b) A FDTD simulation of optical transmission through the slit array. A TM-polarized plane wave ( wavelength) is incident to the bottom side of the slit array.
(Color) FDTD simulations of beam shaping with metallic nanoslit array lenses. The -wide convex region is designed to accommodate up to five slits ( slit width) with slit spacing, and slit depth of 450, 700, 750, 700, and . Beam shaping with (a) a three-slit lens and (b) a five-slit lens structure. A TM-polarized light ( wavelength) is incidnet from the bottom side.
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