A Tunable Ancient Coin-Type Perfect Absorber with High Refractive Index Sensitivity and Good Angular Polarization Tolerance

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.

Automated summary

This paper presents a graphene-based ancient coin-type dual-band perfect metamaterial absorber that can be dynamically controlled by adjusting voltage, showing great potential for application in biopharmaceutical, optical imaging, and other fields.