• 文献标题:   Electrically controllable directional coupler based on tunable hybrid graphene nanoplasmonic waveguide
  • 文献类型:   Article
  • 作  者:   DU W, LI K, WU D, JIAO KP, JIAO LP, LIU LL, XIA F, KONG WJ, DONG LF, YUN MJ
  • 作者关键词:   surface plasmon, graphene, plasmonic waveguide, directional coupler
  • 出版物名称:   OPTICS COMMUNICATIONS
  • ISSN:   0030-4018 EI 1873-0310
  • 通讯作者地址:   Qingdao Univ
  • 被引频次:   7
  • DOI:   10.1016/j.optcom.2018.08.068
  • 出版年:   2019

▎ 摘  要

Graphene as a promising material for terahertz-infrared region plays an important role in nanoplasmonic devices owing to its tunability. We propose a hybrid graphene nanoplasmonic waveguide and analyze its propagation properties by finite element method. The results show that the light in terahertz-infrared region can be confined at low-index material and the fundamental mode can be tuned flexibly by changing Fermi energy level of graphene. Then an application of the designed waveguide, an electrically controllable directional coupler is designed and its performance is numerically verified. This approach can be extended to novel designs of nanoscale integrated photonic devices.