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We consider Wood anomalies in diffraction spectrum from two-dimensionaldielectric periodic grid embedded in a surrounding media. The grid is ofsubwavelength thickness, and diffraction of wave having S-polarization isinvestigated in the vicinity of the emergence of first diffraction maximum. Wereduce Maxwell equations to coupled-mode theory with three parameters, whichare integral characteristics of material arrangement in the grid. Inparticular, we show that such grids are capable to have full reflectance inparametrically narrow frequency bandwidth. The effect is accompanied by aparametric evanescent field enhancement in the region near the grid. Inparticular, we consider grids with sinusoidal profile and show that this typeof grids possesses unique diffraction properties due to absence of the guidedmode coupling. For such grids, there is a thin transparency window at abackground of near to zero transmission at slightly nonnormal incidence. Weestimate what are enough grid size and the incident beam flatness to resolvethe singularities.

Parametric behavior of diffraction on guided-mode resonant grating of subwavelength thickness