Dispersive study on the photonic bandgap of photonic crystal with NIM-PIM alternant multilayer

For studying the pbotonic bandgap of the photonic crystal with NIM-PIM alternant multilayer,the dispersive method is adopted,the photonic bandgap of the photonic crystal with NIM-PIM alternant multilayer is calculated.The forbidden band is very wide and the pass band is very narrow,the central frequency and width of the forbidden band are insensitive to the incident angle.The central frequency and width of the forbidden band are insensitive to the positive refractive index.Width of the forbidden band is great no matter what is the positive refractive index values.These properties are of important significance in applications,such as omnidirectional and great frequency width reflector.