A polarization- and angle-insensitive broadband tunable metamaterial absorber using patterned graphene resonators in the terahertz band

Xuemei Du, Fengping Yan, Wei Wang, Siyu Tan, Luna Zhang, Zhuoya Bai, Hong Zhou, Yafei Hou

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

The emerging material of graphene has resulted in new options for the design of metamaterial devices with excellent performances, offering an attractive platform for electromagnetic absorption applications. To date, researches on patterned graphene-based metamaterial absorbers (MAs), have focused on achieving broadband absorption while maintaining many excellent properties. Here, we propose a broadband tunable MA with a perfect absorption based on a novel design of the combination of cross- and square-shaped graphene sheets. Numerical simulation results show that the bandwidth of the proposed broadband MA reaches 2.76 THz with the absorptivity greater than 90% for both the transverse electric (TE) and transverse magnetic (TM) modes, which exceeds most of broadband absorption results achieved by MAs in previous studies. A numerical analysis employing the equivalent circuit model for the designed structure is conducted to determine the influence of the structural parameters on the absorptivity and optimize the parameters. Results show that impedance matching is achieved between the input impedance and the free-space impedance at the absorption band. Detailed numerical simulations are conducted to calculate the surface loss density, electric field, and surface currents to obtain an understanding of the high absorption mechanism. Also, the designed MA exhibits excellent properties, such as tunability, polarization independence, incident angle insensitivity and outstanding tolerance to changes in the structural parameters, suggesting that the proposed absorber is a promising candidate for various applications in the terahertz band.

Original languageEnglish
Article number106513
JournalOptics and Laser Technology
Volume132
DOIs
Publication statusPublished - Dec 2020

Keywords

  • Broadband metamaterial absorber
  • Insensitivity
  • Patterned-graphene
  • Surface plasmon resonance
  • Tunability

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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