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Schematic view of the lamellar transmission metallic gratings in vacuum with grating parameters as period , aperture , and thickness .
(Color online) Photonic band structure of the surface plasmons responsible for the transmission resonances of gold gratings in vacuum with slit shape as (a) straight channel and (b) CDC with . The grating parameters are fixed at , , and . Also seen in figures are energetic positions (white dashed lines) of the SPP modes.
(Color online) Transmittance of the gold gratings in vacuum for CDC as a function of the wavelength and distance at the gap of throat with constant grating parameters as , , and .
Transmittance of a gold grating in vacuum with channel shape as CDC and converging at incident wavelength of and with the grating parameters as , , and .
Normalized electric field component at an incident wavelength of along the channel centerline of a gold grating in vacuum with (a) converging channel and (b) CDC for different gaps at the throat and grating parameters as , , and .
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