Abstract
Numerical results for the spatial distributions of the light transmitted through metallic planar lenses composed of symmetric nanogroove arrays on the surfaces of a gold film deposited on a dielectric substrate are presented and explained. Both the near and far-field distributions of the intensity of light transmitted through such films, which are modeled by two aligned and reversed one-dimensional surface profile functions, are calculated by the use of a Green's function formalism. The focusing action obtained for different groove-width variations is investigated thoroughly. Results for an optimal transverse focus based on a quadratic variation of groove width across the array are also obtained, in addition to the effect of groove shape on the sharpness of planar lens focusing. Meanwhile, a significant dependence of the focal length on the wavelength of light incident from the air side through the gold film into a dielectric substrate is found for this detector configuration.
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