Dual-band coherent perfect absorption based on graphene patterned metasurface with tunable absorption frequency and absorptivity

Sha Huang; Ling Li; Weidong Chen; Jinqiao Lei; Fengling Wang; Ke Liu; Zhengwei Xie

doi:10.1117/12.2507220

24 January 2019 Dual-band coherent perfect absorption based on graphene patterned metasurface with tunable absorption frequency and absorptivity

Sha Huang, Ling Li, Weidong Chen, Jinqiao Lei, Fengling Wang, Ke Liu, Zhengwei Xie

Author Affiliations +

Proceedings Volume 10840, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Micro- and Nano-Optics, Catenary Optics, and Subwavelength Electromagnetics; 108400E (2019) https://doi.org/10.1117/12.2507220
Event: Ninth International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT2018), 2018, Chengdu, China

Abstract

We propose that dual-band coherent perfect absorption in the infrared can be achieved in a metasurface, which contains periodical symmetrically patterned elliptical graphene array on both sides of the silicon dioxide film. The physical mechanism of dual-band absorption is that the major and minor axes of the elliptical graphene disk have different widths and can produce resonances at different frequencies. Based on the independent resonances, the asymmetrically patterned metasurface can separately absorb light of different frequencies for TE and TM polarizations, which is useful to detect the polarization of incident light. In addition, the coherent absorptivity of each peak can be tuned by phase modulation and the dual-band absorption frequencies can be flexibly adjusted by changing the Fermi level of the graphene via chemical or electronic doping. Therefore, our proposed metasurface can achieve the double modulation for both absorption frequency and absorptivity, which make it a good candidate for optical switch and absorption modulator.

Citation Download Citation

Sha Huang, Ling Li, Weidong Chen, Jinqiao Lei, Fengling Wang, Ke Liu, and Zhengwei Xie "Dual-band coherent perfect absorption based on graphene patterned metasurface with tunable absorption frequency and absorptivity", Proc. SPIE 10840, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Micro- and Nano-Optics, Catenary Optics, and Subwavelength Electromagnetics, 108400E (24 January 2019); https://doi.org/10.1117/12.2507220

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KEYWORDS

Absorption

Graphene

Polarization

Terahertz radiation

Modulation

Dielectric polarization

Electromagnetism

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