• 文献标题:   Enhanced Reflected Group Delay with Optical Tamm State via Graphene-Dielectric Bragg Mirror Configuration
  • 文献类型:   Article
  • 作  者:   TANG J, XU J, ZHOU H, ZHENG ZW, ZHOU YX, WENG R, WEI YY, LIU Y, LIU QW, JIANG LY, QIAN SY
  • 作者关键词:  
  • 出版物名称:   ADVANCES IN CONDENSED MATTER PHYSICS
  • ISSN:   1687-8108 EI 1687-8124
  • 通讯作者地址:   Hunan Normal Univ
  • 被引频次:   2
  • DOI:   10.1155/2019/9217613
  • 出版年:   2019

▎ 摘  要

Group delay of the optical pulse reflected from the structure composed of graphene and one dimensional photonic crystal (1D PC) is studied. It is shown that the large negative group delay in this configuration can be realized due to the excitation of the optical Tamm state (OTS) at a graphene-dielectric interface. The reflected group delay can be enlarged negatively and can be switched from positive to negative or vice versa. We show that the conductivity of graphene has a significant influence on reflected group delay, making the graphene-PC structure be a good candidate for dynamic tunable optical delay device in the THz frequencies. Furthermore, the influences of the relaxation time of graphene, the incident angel, and the dispersion characteristics of top layer on group delay are clarified.