基于两个平行金属表面纹理与凹槽阵列的太赫兹阻带滤波器

Tao Li, Dongxiao Yang, Lei Rao, Song Xia
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引用次数: 4

摘要

本文提出了一种紧凑的太赫兹阻带滤波器,它由两个周期为a的矩形槽阵列的平行金属表面波纹组成。当金属表面周期性波纹时,入射的太赫兹波可以激发表面电磁模式。这些模式是表面等离子体激元,其有效等离子体频率完全由表面几何形状控制。由于波纹沟槽和几何结构引起的高约束表面等离子激元极化,平行金属板的基模分裂为两个模,并且在两个模之间存在带隙。带阻滤波功能是通过抑制间隙中的所有频率来实现的。有限元模拟结果表明,当沟槽深度d = 0.5a,沟槽宽度l = 0.5a,两个平行金属表面间隙宽度w = 2a时,该结构的带隙范围为0.315c/a ~ 0.350c/a。在不支持导模的带隙区域内,透射光谱也显示为零透射。通过改变间隙宽度w和沟槽深度d,可以实现不同中心频率下的不同滤波带宽。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A terahertz stop band filter based on two parallel metallic surfaces textured with groove arrays
In this paper, a compact terahertz stop band filter is presented, which consists of two parallel metallic surfaces corrugated with rectangular groove arrays of period a. When a metallic surface is periodically corrugated, surface electromagnetic modes can be excited by incident terahertz waves. These modes are surface plasmon polaritons with an effective plasma frequency controlled entirely by the surface geometry. Because of the corrugated grooves and geometry induced highly confined surface plasmon polaritons, the fundamental mode of the parallel metallic plates splits into two modes and there is a band gap between the two modes. The band stop filtering functionality is realized by rejecting all frequencies in the gap. Simulation results calculated by finite element method show that the proposed structure has a band gap ranging from 0.315c/a to 0.350c/a for groove depth d = 0.5a, groove width l = 0.5a and gap width of the two parallel metallic surfaces w = 2a. Transmission spectra also show zero transmission within the band gap region where no guided modes are supported. By varying the gap width w and groove depth d, different filtering bandwidths with different center frequencies can be achieved.
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