Angular and wavelength selectivity of band gaps of holographic photonic crystals for different polarizations
一维光子晶体带隙结构对不同偏振态的角度和波长响应

The angular and wavelength selectivities of band gaps of holographic photonic crystals were calculated using transfer matrix method for different polarizations. It showed that the width of the band gaps for P_polarization is narrower than that for S_polarization. About the angular selectivity, the changing trends for different polarizations are the same, but with different degree of variations. About the wavelength selectivity, the changing trends for different polarizations are in an opposite way. A \!general Brewster's angle\" is introduced. The theoretical analysis shows that when a beam incident on a photonic crystal just at the \!general Brewster's angle\", the forbidden band of S_polarization will still exist as it is, while the forbidden band of P_polarization will vanish. Therefore, a \!defect mode\" can be obtained in the forbidden band of S_polarization by illuminating the photonic crystal with P_polarization beam at the !general Brewster's angle". The experimental results for verifying the theoretical calculations were given.