Switchable Fano Resonance Based on Cut-Induced Asymmetric Split-Ring Resonators with Dirac Semimetal Film

被引：5
|
作者：
Tu, Dehua [1 ]
Wu, Yiping [1 ]
Xie, Jingya [1 ]
Zang, Xiaofei [1 ]
Ding, Li [1 ]
Chen, Lin [1 ,2 ]
机构：
[1] Univ Shanghai Sci & Technol, Shanghai Key Lab Modern Opt Syst, Shanghai 200093, Peoples R China
[2] Tongji Univ, Shanghai Inst Intelligent Sci & Technol, Shanghai 200092, Peoples R China
来源：
PLASMONICS | 2021年 / 16卷 / 04期
基金：
国家重点研发计划; 中国国家自然科学基金;
关键词：
Terahertz; Dirac semimetal film; Sensitivity; Fano resonance;
D O I：
10.1007/s11468-021-01417-6
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
We present cut-induced asymmetric split-ring resonator (CASRR) structure that can achieve switchable Fano resonance based on Dirac semimetals at the terahertz region. By changing the asymmetric geometric parameter from 3 to 13 mu m, the transmission spectrum can be switched from single to dual channel and the Fano resonance can be gradually enhanced, which is consistent with the two coupled oscillators model. Meanwhile, the Fano effect can also be effectively switched by adjusting the Fermi energy of Dirac semimetal film (DSF) and it is suitable for practical applications. In the view of sensing application, the sensitivity based on Fano resonance is up to 69.75 GHz/RIU and 134.25 GHz/RIU with the thickness of sample 1 mu m and 20 mu m, respectively. Such manipulation of Fano resonance by using DSF may have potential applications in terahertz switch, sensor, and multichannel communication.
引用
收藏
页码：1405 / 1415
页数：11
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