Tunable and polarization-sensitive graphene-based terahertz absorber with eight absorption bands. (25th February 2021)

• Record Type: Journal Article
• Authors: Cai, Yijun; Guo, Yongbo; Zhang, Hongyi; Wang, Yi; Chen, Chengying; Lin, Feng; Zuo, Shikai; Zhou, Yuanguo
• Is Part Of: Journal of physics. Volume 54:Number 19(2021)
• Publication Date: 2021-02-25
• Subjects: terahertz absorber -- graphene plasmon -- multiband absorber; Physics -- Periodicals; 530
• DOI: 10.1088/1361-6463/abe159
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: A metamaterial absorber consisting of stacked and orthogonal elliptical graphene layers is proposed to achieve eight absorption bands in the terahertz (THz) frequency range. By adjusting the length of the short or long axis for each graphene ellipse, the corresponding absorption peak can be tuned independently. Electric field distributions are present to reveal the physical mechanism. The absorption spectrum can also be tuned by varying the chemical potential of each graphene ellipse and the manipulation for the polarization angle of the incidence. Moreover, the absorber can work properly under oblique incidences. Our work paves a way for designing tunable THz absorbers with numerous absorption bands.