• 文献标题:   Tunable ultrathin ultrabroadband metamaterial absorber with graphene-stack-based structure at lower terahertz frequency
  • 文献类型:   Article
  • 作  者:   DONG YF, YU DW, LI GS, LI GC, MA HM
  • 作者关键词:   metamaterial absorber, ultrathin ultrabroadband, tunable, terahertz, graphene
  • 出版物名称:   PHYSICA ELOWDIMENSIONAL SYSTEMS NANOSTRUCTURES
  • ISSN:   1386-9477 EI 1873-1759
  • 通讯作者地址:  
  • 被引频次:   7
  • DOI:   10.1016/j.physe.2020.114608 EA JAN 2021
  • 出版年:   2021

▎ 摘  要

In this paper, we investigate the absorption characteristic of the graphene-stack-based metamaterial absorber at the lower terahertz frequency range for the ultrathin and ultrabroadband. The absorption spectrum can be dynamically controlled by changing the gate voltage on the graphene-stack cavity. The thickness of a designed structure is only lambda(0)/25.5 with respect to the center frequency. The absorption principle is discussed by modeling equivalent circuit and studying the distribution of electric field and surface currents. The simulated results show that the high absorption above 0.9 in the frequency range of 1.24 THz similar to 2.08 THz can be obtained. The absorption performance is insensitive to different incidence angles. The research results have great application potentials in the design of the terahertz device.