• 文献标题:   Dual-frequency unidirectional reflectionless propagation in a non-Hermitian graphene plasmonic waveguide-cavity coupling system
  • 文献类型:   Article
  • 作  者:   YANG GF, DING J, WANG YK
  • 作者关键词:  
  • 出版物名称:   APPLIED OPTICS
  • ISSN:   1559-128X EI 2155-3165
  • 通讯作者地址:  
  • 被引频次:   0
  • DOI:   10.1364/AO.425139
  • 出版年:   2021

▎ 摘  要

We theoretically investigate a controllable dual-frequency unidirectional reflectionlessness at exceptional points by applying external voltage in a graphene plasmonic waveguide system. The system consists of a graphene wave-guide and two end-coupled resonators. COMSOL simulation results show that the reflection of edge fundamental graphene surface plasmon polaritons mode for forward (backward) incidence is near to zero at frequency 24.418 THz (20.865 THz), while that for backward (forward) incidence is 24.71% (22.945%), respectively. In addition, the non-Hermitian scattering matrix is proposed to verify the existence of double exceptional points, and the tunable unidirectional reflectionless phenomenon is also achieved by changing the Fermi level (E-f) of graphene. (C) 2021 Optical Society of America