太赫兹科学与电子信息学报, 2018, 16 (2): 191, 网络出版: 2018-06-09
基于磁束缚模式相消干涉的类EIT超材料
A novel EIT-like metamaterial based on destructive interference between magnetic trapped modes
电磁诱导透明 超材料 太赫兹 磁束缚模式 Q值 双频滤波 electromagnetically induced transparency metamaterial terahertz magnetic trapped mode Q factor dual band filter
摘要
提出一种具有电磁诱导透明 (EIT)效应的太赫兹超材料。该结构单元由非对称排布的 2对双金属线 (aCWs)组成。当入射电场为垂直极化时, 所提结构在 0.580 8 THz附近产生磁束缚模式的相消干涉, 形成一个 Q值较高的异常透明峰。在单元中加入开口谐振环 (SRR), SRRs与非对称双金属线对之间产生干涉, 形成新的透明峰。加入 SRRs后, 2对双金属线干涉产生的透明峰的传感特性得到改善。仿真表明, aCWs以及其与 SRRs组合而成的结构 (aCWs/SRRs)可用于太赫兹的单频带通滤波、双频滤波以及传感。
Abstract
A novel Electromagnetically Induced Transparency(EIT)-like metamaterial of terahertz domain is presented. The unit cell consists of a couple of asymmetric Cut Wires(aCWs). When the incident electric field is perpendicularly polarized, the destructive interference between two magnetic trapped modes is observed at 0.580 8 THz, which produces an exotic transparent peak with high Q factor. A Split Ring Resonators(SRR) is added in aCWs, and a new resonant peak emerges due to the destructive interference of the SRRs and aCWs. The sensing performance of the transparent peak produced by aCWs is improved. Numerical simulations indicate that the aCWs and the structure composed by aCWs and SRRs(aCWs/SRRs) can be applied as single band and dual band bandpass filter in terahertz domain. The proposed structures provide new insight into designing EIT-like metamaterial.
唐雨竹, 马文英, 魏耀华, 汪为民. 基于磁束缚模式相消干涉的类EIT超材料[J]. 太赫兹科学与电子信息学报, 2018, 16(2): 191. TANG Yuzhu, MA Wenying, WEI Yaohua, WANG Weimin. A novel EIT-like metamaterial based on destructive interference between magnetic trapped modes[J]. Journal of terahertz science and electronic information technology, 2018, 16(2): 191.