Journal of Terahertz Science and Electronic Information Technology , Volume. 18, Issue 6, 979(2020)
Implementation of EIT-like effects in multi-resonant terahertz toroidal dipole metasurface
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 multi-toroidal dipole resonance metasurface not only provides an effective way for realizing the EIT effect but also facilitates the development of more terahertz functional devices.
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WANG Song, WANG Shuang, ZHU Jianyu, ZHAO Xiaoli, LI Quan. Implementation of EIT-like effects in multi-resonant terahertz toroidal dipole metasurface[J]. Journal of Terahertz Science and Electronic Information Technology , 2020, 18(6): 979
Received: Sep. 20, 2019
Accepted: --
Published Online: Apr. 20, 2021
The Author Email: Shuang WANG (wangshuang@tute.edu.cn)