Abstract
The anomalies of optical diffraction gratings have been of interest since they were originally discovered by Wood in 1902. They manifest themselves as rapid variation in the intensity of the various diffracted spectral orders within certain narrow frequency bands. There are two principal types of anomalous effects: the Rayleigh type which is the classical Wood’s anomaly, and the less known resonant type [8]. The Rayleigh type is due to one of the spectral orders appearing (or disappearing) at the grazing angle (propagating along the surface); while the resonant type anomaly is due to possible guided modes supportable by the waveguide grating. In this paper, we focus on the design of the waveguide-grating resonances, also known as guided mode grating resonance filters (GMGRF).
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