中文摘要：

本文用平面波展开法研究了太赫兹波（THz）在二维正方晶格光子晶体中的传播特性。分析了晶格常数为a=0.1mm的正方晶格介质柱二维光子晶体,在0~1.8THz频段范围内,通过数值计算,发现当介质圆柱半径r=0.2a时,E偏振出现最大绝对光子带隙,带隙位于0.283-0.400THz,带隙宽度为0.117THz,相应的带隙波长范围为84.9μm至120μm,处于THz波段,并分析了随着相对介电常数差值的增大出现的TM带隙宽度增大。研究结果为THz器件的开发提供了理论依据。

英文摘要：

Characteristic of two- dimensional square lattice photonic crystal in THz range was studied by using PWM. 2D square Lattice Photonic Crystal with lattice constant 0.1 mm was analyzed,. It was shown that 2D square Lattice Photonic Crystal can generate maximum photonic band gap with width 0.117THz in the frequency range of 0. 283- 0.4THz , and when the radius was 0.20a, corresponding to the wavelength range of 84.9 - 120μm, with belong to THz rang. This research provides theoretic basis for the development of THz devices.