中国物理B ›› 2021, Vol. 30 ›› Issue (11): 117803-117803.doi: 10.1088/1674-1056/abff27

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Retrieval of the effective constitutive parameters from metamaterial absorbers

Shaomei Shi(石邵美), Xiaojing Qiao(乔小晶), Shuo Liu(刘朔), and Weinan Liu(刘卫南)   

  1. School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081, China
  • 收稿日期:2021-02-15 修回日期:2021-04-15 接受日期:2021-05-08 出版日期:2021-10-13 发布日期:2021-11-06
  • 通讯作者: Xiaojing Qiao E-mail:qxjbit84@163.com
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 11872013).

Retrieval of the effective constitutive parameters from metamaterial absorbers

Shaomei Shi(石邵美), Xiaojing Qiao(乔小晶), Shuo Liu(刘朔), and Weinan Liu(刘卫南)   

  1. School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081, China
  • Received:2021-02-15 Revised:2021-04-15 Accepted:2021-05-08 Online:2021-10-13 Published:2021-11-06
  • Contact: Xiaojing Qiao E-mail:qxjbit84@163.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 11872013).

摘要: The equivalent medium theory of metamaterials provides a way to obtain their effective constitutive parameters. However, because of its non-reciprocity, the complexity of the electromagnetic coupling, and a metallic bottom layer, it has been challenging to retrieve them from a metamaterial absorber. In this paper, we propose a method without any approximation to obtain them, in which the non-reciprocity and the strong electromagnetic coupling are included. Compared with the three methods such as symmetric metamaterial method, asymmetric metamaterial method and metasurface method, our method can reveal the metamaterial absorber's electrical and magnetic resonance and show its electromagnetic coupling coefficients. To deal with a metamaterial absorber with a metallic bottom layer, four corners of the metallic bottom layer in the unit cell are removed, making it possible to retrieve the electromagnetic parameters. Surprisingly, these results show that the metamaterial absorber with a metallic bottom layer in our example operates in a negative refraction state at the half absorption frequencies, which helps further understand the absorbing mechanism of these metamaterial absorbers.

关键词: effective constitutive parameters, metamaterial absorber, negative refraction

Abstract: The equivalent medium theory of metamaterials provides a way to obtain their effective constitutive parameters. However, because of its non-reciprocity, the complexity of the electromagnetic coupling, and a metallic bottom layer, it has been challenging to retrieve them from a metamaterial absorber. In this paper, we propose a method without any approximation to obtain them, in which the non-reciprocity and the strong electromagnetic coupling are included. Compared with the three methods such as symmetric metamaterial method, asymmetric metamaterial method and metasurface method, our method can reveal the metamaterial absorber's electrical and magnetic resonance and show its electromagnetic coupling coefficients. To deal with a metamaterial absorber with a metallic bottom layer, four corners of the metallic bottom layer in the unit cell are removed, making it possible to retrieve the electromagnetic parameters. Surprisingly, these results show that the metamaterial absorber with a metallic bottom layer in our example operates in a negative refraction state at the half absorption frequencies, which helps further understand the absorbing mechanism of these metamaterial absorbers.

Key words: effective constitutive parameters, metamaterial absorber, negative refraction

中图分类号:  (Multilayers; superlattices; photonic structures; metamaterials)

  • 78.67.Pt
81.05.Xj (Metamaterials for chiral, bianisotropic and other complex media) 78.20.Ci (Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)) 41.20.Jb (Electromagnetic wave propagation; radiowave propagation)