Scattering of chiral photonic crystal

We propose a new photonic crystal using chiral media. Numerical results based on TM mode excitation are given to discuss physical properties. At low frequencies, the scattering of plane waves by the chiral photonic crystal acts approximately as the scattering of plane waves by a uniform chiral slab with parameters equal to the average of those for the periodic layer. At higher frequencies, we find anomalous coupling regions known as Wood's anomalies and are explained by the excitation and reradiation of leaky waveguide modes in the periodic layer. This device can possess both frequency selection and mode conversion properties.