光电工程, 2017, 44 (4): 453, 网络出版: 2017-07-10
一种旋转可调的太赫兹超材料及其传感特性
A tunable terahertz metamaterial and its sensing performance
太赫兹 超材料 电磁诱导透明 可调性 高Q值 传感特性 terahertz metamaterial electromagnetically induced transparency tunability high Q factor sensing performance
摘要
本文设计了一种具有电磁诱导透明(EIT)效应的太赫兹超材料,其单元结构由水平放置的单金属线以及垂直放置的双金属线组成。仿真结果表明,通过单金属线绕其自身中心旋转,可以激发出电磁诱导透明效应。金属线的旋转角度逐渐变大,透明峰的幅度也随之增大,当旋转角度为60°时达到最大值;旋转角度进一步增大,透明峰的幅度逐渐降低;旋转角度为90°时,透明峰消失。仿真说明该结构可以通过单金属线的旋转调控透明峰的出现。最后,对旋转角度为60°时结构的传感特性进行了分析。该结构设计简单,具有可调性、较高的Q值以及良好的传感特性。
Abstract
A novel electromagnetically induced transparency (EIT)-like metamaterial of terahertz domain is pro-posed. The metamaterial is composed of a single metal wire and a couple metal wires above it. Numerical sim-ulations demonstrate that by rotating the single metal wire around its center, EIT phenomenon is created. The amplitude of the transparent peak increases as the rotation angle increases. When the rotation angle is 60°, the amplitude of the transparent peak reaches its maximum. However, as the rotation angle keeps increasing, the amplitude of the transparent peak gets lower and the peak finally vanishes as the rotation angle equals 90°. We also analyze the sensing performance of the metamaterial with the rotation angle of 60°. The proposed structure is simple and adjustable, with high Q-factor value and good sensing performance.
唐雨竹, 马文英, 魏耀华, 汪为民. 一种旋转可调的太赫兹超材料及其传感特性[J]. 光电工程, 2017, 44(4): 453. Yuzhu Tang, Wenying Ma, Yaohua Wei, Weimin Wang. A tunable terahertz metamaterial and its sensing performance[J]. Opto-Electronic Engineering, 2017, 44(4): 453.