Analysis of Anomalous Diffraction Phenomena in Resonance on Dielectric Optical Gratings

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  • Analysis of Anomalous Diffraction Pheno

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Abstract

The resonance properties of the unslanted, planar diffraction gratings are presented and explained by means of modal expansion theory with a almost periodic functions for dielectric gratings. It is shown that these structures function as filters that produce complete exchange of energy between transmitted waves and reflected waves with smooth line shapes and arbitrarily narrow filter frequency bandwidths. Furthermore, the frequency bandwidths and the resonance frequencies can be controlled, separately, by the grating modulation amplitude and the grating thickness. The diffraction grating can be utilized as the optical resonance filter that represents a basic optical element with significant potential for practical applications.

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