Abstract
In this paper, a dual-band perfect metamaterial absorber based on graphene is proposed in the terahertz region. The metamaterial absorber consists of two sizes of graphene disks and a gold film separated by a dielectric spacer in a unit cell. The numerical results demonstrate that the dual-band perfect absorption can be achieved by the superposition of the specific absorption peaks induced by different disks. The resonance frequency can be tuned via controlling the graphene conductivity and the sizes of the disks. The metamaterial absorber can achieve selectively frequency tunability and it can tune each resonance independently. And the dual-band absorption will not be changed when the small disks move along the diagonal within the range of our research. In addition, owing to the symmetry of the structure, the absorber is insensitive to polarization and can keep a high absorptivity with a wide angle. The flexible and simple design makes it possible for our proposed single-layer graphene absorber to be applied in many metamaterial fields, such as sensing, detecting, and cloaking objects.
© 2018 Optical Society of America
Full Article | PDF ArticleMore Like This
Yi Zhao, Qiuping Huang, Honglei Cai, Xiaoxia Lin, Hongchuan He, Tian Ma, and Yalin Lu
Opt. Express 27(4) 5217-5229 (2019)
Jiangnan Si, Zhewei Dong, Xuanyi Yu, and Xiaoxu Deng
Opt. Express 26(17) 21768-21777 (2018)
Tongling Wang, Maoyong Cao, Huiyun Zhang, and Yuping Zhang
Appl. Opt. 57(32) 9555-9561 (2018)