• 文献标题:   Terahertz wavefront control by tunable metasurface made of graphene ribbons
  • 文献类型:   Article
  • 作  者:   YATOOSHI T, ISHIKAWA A, TSURUTA K
  • 作者关键词:  
  • 出版物名称:   APPLIED PHYSICS LETTERS
  • ISSN:   0003-6951 EI 1077-3118
  • 通讯作者地址:   Okayama Univ
  • 被引频次:   38
  • DOI:   10.1063/1.4927824
  • 出版年:   2015

▎ 摘  要

We propose a tunable metasurface consisting of an array of graphene ribbons on a silver mirror with a SiO2 gap layer to control reflected wavefront at terahertz frequencies. The graphene ribbons exhibit localized plasmon resonances depending on their Fermi levels to introduce abrupt phase shifts along the metasurface. With interference of the Fabry-Perot resonances in the SiO2 layer, phase shift through the system is largely accumulated, covering the 0-to-2 pi range for full control of the wavefront. Numerical simulations prove that wide-angle beam steering up to 53 degrees with a high reflection efficiency of 60% is achieved at 5 THz within a switching time shorter than 0.6 ps. (C) 2015 AIP Publishing LLC.