Active Switching of Toroidal Resonances by Using a Dirac Semimetal for Terahertz Communication

Frontiers in Physics

Lin Chen¹  Jinjin Xu²  Yiping Wu²  Yuanbao Sun²  Denggao Liao² 

[1] Shanghai Institute of Intelligent Science and Technology, Tongji University, Shanghai, China;Shanghai Key Laboratory of Modern Optics and Systems, University of Shanghai for Science and Technology, Shanghai, China;

关键词: dirac semimetal;    toroidal dipole;    frequency switching;    terahertz communication;    metasurface;   

DOI  :  10.3389/fphy.2020.602772

来源: DOAJ

【 摘 要 】

The dynamical switching of a toroidal dipole resonance channel is demonstrated by tuning the Fermi level of a Dirac semimetal film sandwiched between the back substrates. As the Fermi level is increased from 30 to 150 meV, the resonance frequency is switched from 0.283 to 0.201 THz because of the transition from toroidal mode to hybrid mode. The hybrid mode is formed by the interaction between the toroidal mode and the plasmonic mode (induced by a Dirac semimetal film with metallic properties). The influence of the sandwiched dielectric layer (between the toroidal metasurface pattern and the Dirac semimetal film) on the switching effect was also investigated. This active dual-channel terahertz switching may have potential applications in advanced terahertz communication.

【 授权许可】

Unknown