Numerical analysis of transmission properties of SiO2/Si photonic crystal

The finite difference time domain method was used to simulate the transmission characteristics of 2-D triangular lattices SiO2/Si photonic crystal.Furthermore,it was also studied how the change of the shape of SiO2 and the mode of incident wave affect transmission properties of photonic crystal.The curves of transmissivity versus frequency of the incident wave in the different conditions were obtained.The calculated results obviously show that the band gap width and position are related to the shape of SiO2 in photonic crystal.With the increase of the radius of SiO2 cylinder, the band gap is widened and the central frequency is enhanced,but the largest band gap appears when R=0.4α.Compared with TM wave, the band gap appears more easily under the TE wave.The study provides the theory basis of the manufacture and application of photonic crystal.