为了研究太赫兹波在2维正方晶格光子晶体中的传播特性,利用平面波展开法数值模拟了光子晶体能带结构和态密度分布。计算表明,E偏振当填充率f=0.6362 和H偏振当填充率f=0.7845 时出现最大光子带隙,在f=0.7791出现最大完全光子带隙;增加介电常数的差值,也增加了太赫兹波在正方晶格光子晶体中传输的带隙;光子晶体态密度的分布验证了存在光子带隙的范围。研究结果为太赫兹波器件的开发提供了理论依据。

In order to study the propagation characteristics of two-dimension square lattice photonic crystal in THz rang, the band gap structure and density of photon states were calculated by plane-wave expansion method.It was found that the maximum photonic band gap generated when the f was 0.6362 and 0.7854 in the E and H polarization,and the maximum absolute photonic band gap generated when the f=0.7791;and large photonic band gap would generate by increasing difference inralue of dielectric constant;the photonic band structure was also shown by the photonic density of states.It turned out that this research provides theoretic basis for the development of THz devices.