4.6 Article

Dynamically tunable plasmon-induced transparency effect based on graphene metasurfaces

Journal

JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 55, Issue 11, Pages -

Publisher

IOP Publishing Ltd
DOI: 10.1088/1361-6463/ac3f5b

Keywords

graphene; plasmon-induced transparency; optical switch; high sensitivity; mode

Funding

  1. National Key R&D Program of China [2019YFB1803505]
  2. National Natural Science Foundation of China [62175039, U2001601, 61925501]
  3. Science and Technology Project of Guangzhou [201904010243]
  4. Major Special Projects in Guangdong Province [2018B010114002]
  5. Program for Guangdong Introducing Innovative and Enterpreneurial Teams

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In this study, plasmon-induced transparency (PIT) in a graphene metamaterial is explored through numerical simulations and theoretical analysis. The proposed structure allows dynamic regulation of the PIT window by adjusting the Fermi level of the graphene, with a modulation depth of 90.4%. The refractive index sensitivity of the PIT window is found to be 1.335 THz RIU-1.
Plasmon-induced transparency (PIT) is theoretically explored for a graphene metamaterial using finite-difference time-domain numerical simulations and coupled-mode-theory theoretical analysis. In this work, the proposed structure consists of one rectangular cavity and three strips to generate the PIT phenomenon. The PIT window can be regulated dynamically by adjusting the Fermi level of the graphene. Importantly, the modulation depth of the amplitude can reach 90.4%. The refractive index sensitivity of the PIT window is also investigated, and the simulation results show that a sensitivity of 1.335 THz RIU-1 is achieved. Additionally, when the polarization angle of the incident light is changed gradually from 0 degrees to 90 degrees, the performance of the structure is greatly affected. Finally, the proposed structure is particularly enlightening for the design of dynamically tuned terahertz devices.

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