• 文献标题:   Broadband Filter and Adjustable Extinction Ratio Modulator Based on Metal-Graphene Hybrid Metamaterials
  • 文献类型:   Article
  • 作  者:   SUN HY, ZHAO L, DAI JS, LIANG YY, GUO JP, MENG HY, LIU HZ, DAI QF, WEI ZC
  • 作者关键词:   metamaterial, extinction ratio, bandwidth, eit analogue
  • 出版物名称:   NANOMATERIALS
  • ISSN:  
  • 通讯作者地址:   South China Normal Univ
  • 被引频次:   1
  • DOI:   10.3390/nano10071359
  • 出版年:   2020

▎ 摘  要

A novel multifunctional device based on a hybrid metal-graphene Electromagnetically induced transparency (EIT) metamaterial at the terahertz band is proposed. It is composed of a parallel cut wire pair (PCWP) that serves as a dark mode resonator, a vertical cut wire pair (VCWP) that serves as a bright mode resonator and a graphene ribbon that serves as a modulator. An ultra-broadband transmission window with 1.23 THz bandwidth can be obtained. The spectral extinction ratio can be tuned from 26% to 98% by changing the Fermi level of the graphene. Compared with previous work, our work has superior performance in the adjustable bandwidth of the transmission window without changing the structure of the dark and bright mode resonators, and has a high extinction ratio and dynamic adjustability. Besides, we present the specific application of the device in filters and optical modules. Therefore, we believe that such a metamaterial structure provides a new way to actively control EIT-like, which has promising applications in broadband optical filters and photoelectric intensity modulators in terahertz communications.