Band gap of biperiodic photonic crystals

In order to study the characteristics of band-gaps of 1-D biperiodic photonic crystals,the band-gaps of 1-D biperiodic photonic crystals prepared at different wavelengths were calculated by means of transfer matrix method.Calculation results show that the band-gap in this biperiodic structure is equivalent to the sum of both the single band gaps.Under certain conditions,the band gaps of the biperiodic photonic crystals were broadened.The home position of the broadened band gap is equal to the mean value of both the single positions.