• 文献标题:   Tunable graphene-based mid-infrared plasmonic multispectral and narrow band-stop filter
  • 文献类型:   Article
  • 作  者:   WANG XJ, MENG HY, LIU S, DENG SY, JIAO T, WEI ZC, WANG FQ, TAN CH, HUANG XG
  • 作者关键词:   bandstop filter, optical switching, surface plasmon, graphene metamaterial
  • 出版物名称:   MATERIALS RESEARCH EXPRESS
  • ISSN:   2053-1591
  • 通讯作者地址:   South China Normal Univ
  • 被引频次:   5
  • DOI:   10.1088/2053-1591/aabbf7
  • 出版年:   2018

▎ 摘  要

In this paper, we numerically investigate the band-stop properties of single- or few-layers doped graphene ribbon arrays operating in the mid-infrared region by finite-difference time-domain method (FDTD). A perfect band-stop filter with extinction ratio (ER) similar to 17 dB, 3 dB bandwidth similar to 200 nm and the resonance notch located at 6.64 mu m can be achieved. And desired working regions can be obtained by tuning the Fermi level (E-f) of the graphene ribbons and the geometrical parameters of the structure. Besides, by tuning the Fermi level of odd or even graphene ribbons with terminal gate voltage, we can achieve a dual-circuit switch with four states combinations of on-to-off. Furthermore, the multiple filter notches can be achieved by stacking few-layers structure, and the filter dips can be dynamically tuned to achieve the tunability and selective characteristics by tuning the Fermi-level of the graphene ribbons in the system. We believe that our proposal has the potential applications in selective filters and active plasmonic switching in the mid-infrared region.