双面周期开槽型太赫兹滤波器分析

摘要

为了研究双面周期开槽型太赫兹滤波器的传输性能，采用有限元法进行了理论仿真分析。由分析结果可知，其滤波性能随滤波器结构参量变化出现规律性变化。透射峰位置随着周期、缝宽和槽深的增加线性红移，随着槽宽的增加先蓝移后红移；透射率随结构参量周期、缝宽、槽宽和槽深的增加都先增后降，出现超过0.95的极大值；3dB通频带宽度随着缝宽和槽深的增加而增加，随着槽宽和周期的增加变窄。结果表明，相对于常用的光学滤波器，该器件具有高选择性、高中心透射率等特点。%Transmission characteristics of terahertz (THz) wave through a slit with parallel grooves on both sides were analyzed numerically by means of the finite element method (FEM).Simulation results show that the transmissivity peak blue shifts firstly and then red shifts with the increase of groove width ,red shifts with the increase of periodicity ,slit width and groove depth.With each geometrical parameters increasing ,the transmissivity peak increases firstly and then decreases , which is up to 0.95.3dB bandwidth broadens with the increase of slit width and groove depth ,compresses with the increase of slit width and periodicity.Compared with the conventional optical filter ,the Thz filter possesses high selectivity and high center transmissivity.