Tunable terahertz metamaterials with high absorptivity based on graphene structure
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    Abstract:

    A graphene-based dual-band terahertz metamaterial absorber is proposed, and it is comprised of three-layer metamaterial structural unit by periodical expansion in the horizontal direction. The simulation results show that the absorber produces 99.9% and 98.9% high absorptivity in the terahertz bands of 6.62 THz and 9.36 THz respectively. By changing the Fermi level of graphene, the resonant frequency and absorption intensity of the absorber can be flexibly controlled. The absorption intensity of the absorber can also be individually controlled by the relaxation time of the graphene. In addition, the influence of the thickness and loss of the intermediate dielectric layer of the metamaterial absorber on the absorptivity was studied, which is conducive to determine the initial processing parameters of the absorber. The study results show that the proposed graphene-based terahertz metamaterial absorber has a simple structure and is easy to process, moreover, it can realize the tuning of the metamaterial absorber by biased voltages or chemical doping. The metamaterial absorber proposed in this paper provides an important reference for the design of dual-band absorbers with high absorptivity in terahertz band.

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宋建勋,徐永钊,凌东雄,魏东山.基于石墨烯的可调谐高吸收率太赫兹超材料[J]. Journal of Terahertz Science and Electronic Information Technology ,2019,17(6):933~938

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History
  • Received:October 12,2018
  • Revised:
  • Adopted:
  • Online: January 08,2020
  • Published: