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Physical properties of wave scattering by a chiral grating.

Wave scattering by a chiral grating is studied in this paper. Numerical results are given, and physical properties are discussed, including the influence of frequency, angle of incidence, and aspect ratio. At high frequencies we find anomalous coupling regions known as Wood's anomalies, which are explained by the excitation and reradiation of leaky waveguide modes in the periodic layer. The chiral grating can possess both frequency-selection and mode-conversion properties.