Abstract
An analytical treatment based on rigorous coupled wave analysis of optical transmission through a periodically modulated metallic film is presented. We investigate the influence of dielectric dispersion induced by coupled surface plasmons in the air gap on the transmission spectrum. It is shown that the zero-order transmission spectrum displays a peak at Wood's anomaly and a dent for a wavelength slightly shorter than the surface plasmon resonances. This model allows description of the general role of horizontal and vertical coupled surface plasmons on the transmission through periodically modulated metallic films.
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