太赫兹波在光子晶体中的传输特性

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。

Propagation characteristic of Photonic Crystal in THz Range

PWM method was used to simulate the transmission characteristics of two-dimensional square lattice photonic crystal in THz range. It was also studied how the filling factor and dielectric constans affects the band gap structure.The calculation results obviously show that the width and center frequency of band gaps depend on the the filling factor and the difference of dielectric constans. The photonic band structure was also shown by the photonic density of states .This research provides theoretic basis for the development of THz devices.