中国物理B ›› 2019, Vol. 28 ›› Issue (7): 76105-076105.doi: 10.1088/1674-1056/28/7/076105

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Realization of THz dualband absorber with periodic cross-shaped graphene metamaterials

Chunzhen Fan(范春珍), Yuchen Tian(田雨宸), Peiwen Ren(任佩雯), Wei Jia(贾微)   

  1. School of Physical Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
  • 收稿日期:2018-12-24 修回日期:2019-03-20 出版日期:2019-07-05 发布日期:2019-07-05
  • 通讯作者: Chunzhen Fan E-mail:chunzhen@zzu.edu.cn
  • 基金资助:

    Project supported by the Key Science and Technology Research Project of Henan Province, China (Grant Nos. 162102210164 and 1721023100107) and the Natural Science Foundation of Henan Educational Committee, China (Grant No. 17A140002).

Realization of THz dualband absorber with periodic cross-shaped graphene metamaterials

Chunzhen Fan(范春珍), Yuchen Tian(田雨宸), Peiwen Ren(任佩雯), Wei Jia(贾微)   

  1. School of Physical Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
  • Received:2018-12-24 Revised:2019-03-20 Online:2019-07-05 Published:2019-07-05
  • Contact: Chunzhen Fan E-mail:chunzhen@zzu.edu.cn
  • Supported by:

    Project supported by the Key Science and Technology Research Project of Henan Province, China (Grant Nos. 162102210164 and 1721023100107) and the Natural Science Foundation of Henan Educational Committee, China (Grant No. 17A140002).

摘要:

A dualband terahertz (THz) absorber including periodically distributed cross-shaped graphene arrays and a gold layer spaced by a thin dielectric layer is investigated. Numerical results reveal that the THz absorber displays two perfect absorption peaks. To elucidate the resonant behavior, the LC model is introduced to fit the spectra. Moreover, the strength and linewidth of the absorption peak can be effectively tuned with structural parameters and the relaxation time of graphene. Owing to its rotational symmetry, this THz absorber exhibits polarization insensitivity. Our designed absorber is a promising candidate in applications of tunable optical sensors and optical filters.

关键词: dualband, terahertz absorber, graphene, polarization insensitivity

Abstract:

A dualband terahertz (THz) absorber including periodically distributed cross-shaped graphene arrays and a gold layer spaced by a thin dielectric layer is investigated. Numerical results reveal that the THz absorber displays two perfect absorption peaks. To elucidate the resonant behavior, the LC model is introduced to fit the spectra. Moreover, the strength and linewidth of the absorption peak can be effectively tuned with structural parameters and the relaxation time of graphene. Owing to its rotational symmetry, this THz absorber exhibits polarization insensitivity. Our designed absorber is a promising candidate in applications of tunable optical sensors and optical filters.

Key words: dualband, terahertz absorber, graphene, polarization insensitivity

中图分类号:  (Structure of graphene)

  • 61.48.Gh
42.50.Gy (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption) 42.25.Bs (Wave propagation, transmission and absorption) 78.67.Pt (Multilayers; superlattices; photonic structures; metamaterials)