Staked Graphene for Tunable Terahertz Absorber with Customized Bandwidth
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- 作者：Yanqin Wang ; Maowen Song ; Mingbo Pu ; Yu Gu ; Chenggang Hu ; Zeyu Zhao…
- 关键词：Metamaterial absorber ; Terahertz absorber ; Tunable absorber ; Graphene
- 刊名：Plasmonics
- 出版年：2016
- 出版时间：October 2016
- 年：2016
- 卷：11
- 期：5
- 页码：1201-1206
- 全文大小：3,114 KB
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Biotechnology
Nanotechnology
Biophysics and Biomedical Physics
Biochemistry - 出版者：Springer US
- ISSN：1557-1963
- 卷排序：11
文摘
Terahertz (THz) absorber with dynamically tunable bandwidth possesses huge application value in the fields of switches, sensors, and THz detection. However, the perfect absorbers based on photonic crystals and metamaterials are not intelligent enough to capture the electromagnetic wave in a tunable way. In this paper, we utilized only patterned graphene to tune the absorption positions and the bandwidth in the terahertz regime. More distinguished than some dynamic absorbers proposed before, the performances with peak frequency relative tuning range of 68 % and nearly unity absorbance are obtained by a single cross-shaped graphene layer. Additionally, the working bandwidth can be broadened with stacked structured graphene. The almost perfect absorption shifted from 2.36∼3.2 to 3.26∼3.99 THz continuously via changing the chemical potential of graphene.