锥台型光子晶体在太赫兹波段的透射特性

摘要

A frustum photonic crystal which is working in the terahertz band is designed.The CST MWS is used to study the band-gap properties of photonic crystals.From the simulation in THz range from 0.3 THz to 1THz,the frus-tum photonic crystals have photonic band gap.Compared with the general cylindrical photonic crystals,the photonic crystals are simulated by relevant simulation software,it is found that band gap range moves with the change of the pa-rameters,which changes radius of frustum top from 0.05 to 0.1 mm spacing with 0.01 mm,it is found that band gap shifts to high frequency with the decrease of the radius at the top of the frustum.Changing the lattice constant from 0.2 to 0.3 mm spacing with 0.05 mm,it is found that the band gap shifts towards low frequency with the increase of lat-tice constant.The research results provide theoretical basis for the study of the terahertz photonic crystal waveguide.%设计一种工作于太赫兹波段的锥台型光子晶体，利用CST软件研究了光子晶体的禁带特性。通过在0.3～1 THz范围内进行模拟仿真得出，锥台型光子晶体存在光子禁带。与普通的圆柱形光子晶体进行了对比，并对不同的参数进行仿真发现：禁带范围会随着参数的改变而整体移动，其中取锥台顶部半径0.05～0.1 mm间隔0.01 mm，发现随着锥台顶部圆的半径的减小，禁带向高频方向移动。取晶格常数0.2～0.3 mm间隔0.05 mm发现随着晶格常数的增大会使禁带向低频方向移动。研究结果为太赫兹光子晶体波导研究提供理论依据。