摘要
设计了一种在太赫兹波段下的四谐振环偶极子超表面结构,超表面的单元结构由一对反向的非对称开口谐振环(ASRR)及基底介质组成。在其谐振谱中观察到1个典型的类电磁诱导透明(EIT)现象。利用法诺(Fano)谐振模型对这种电磁诱导透明谐振谱进行拟合,良好的拟合结果揭示了不同谐振模式之间的耦合作用。此外,研究发现谐振的电磁特性对金属谐振环的开口间距非常敏感,开口间距的改变带来了谐振的频移和Q值的变化。该多谐振环偶极子超表面不仅为实现EIT效应提供了有效途径,而且有利于开发更多的太赫兹功能器件。
A metasurface with four toroidal dipole resonances in the terahertz band is proposed.The metasurface cell structure consists of a pair of inverted Asymmetric Split Ring Resonators(ASRR)fabricated on a base medium.A typical Electromagnetically Induced Transparency(EIT)phenomenon is observed in its resonant spectrum.The Fano resonance model is adopted to fit EIT transparent resonant spectrum and the good fitting results reveal the coupling effect between different resonant modes.In addition,studies have shown that resonance is very sensitive to the gap of the split ring resonator,and the variation of the gap brings about the frequency shift and a change in Q value of the resonance.This multitoroidal dipole resonance metasurface not only provides an effective way for realizing the EIT effect but also facilitates the development of more terahertz functional devices.
作者
王松
王爽
朱剑宇
赵崤利
李泉
WANG Song;WANG Shuang;ZHU Jianyu;ZHAO Xiaoli;LI Quan(School of Electronic Engineering,Tianjin University of Technology and Education,Tianjin 300222,China)
出处
《太赫兹科学与电子信息学报》
北大核心
2020年第6期979-983,共5页
Journal of Terahertz Science and Electronic Information Technology
基金
国家自然科学基金资助项目(61505146,61705167)
国家教育部回国人员科研启动基金资助项目(第48批)。
关键词
太赫兹
超表面
电磁诱导透明
环偶极子
terahertz
metasurface
electromagnetically induced transparency
toroidal dipole
