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- Title
A Tunable "Ancient Coin"-Type Perfect Absorber with High Refractive Index Sensitivity and Good Angular Polarization Tolerance.
- Authors
Luo, Hao; Shangguan, Qianyi; Yi, Yinting; Cheng, Shubo; Yi, Yougen; Li, Zhizhong
- Abstract
In this paper, we design and present a graphene-based "ancient coin"-type dual-band perfect metamaterial absorber, which is composed of a silver layer, silicon dioxide layer, and a top "ancient coin" graphene layer. The absorption performance of the absorber is affected by the hollowed-out square in the center of the graphene layer and geometric parameters of the remaining nano disk. The optical properties of graphene can be changed by adjusting the voltage, to control the absorption performance of the absorber dynamically. In addition, the centrally symmetric pattern structure greatly eliminates the polarization angle dependence of our proposed absorber, and it exhibits good angular polarization tolerance. Furthermore, the proposed "ancient coin"-type absorber shows great application potential as a sensor or detector in biopharmaceutical, optical imaging, and other fields due to its strong tunability and high refractive index sensitivity.
- Subjects
ANCIENT coins; REFRACTIVE index; BREWSTER'S angle; OPTICAL properties; SILICA; OPTICAL images
- Publication
Coatings (2079-6412), 2021, Vol 11, Issue 7, p814
- ISSN
2079-6412
- Publication type
Article
- DOI
10.3390/coatings11070814