Terahertz absorber based on graphene coating

Panpan Ren; Guanmao Zhang; Litao Qiao; Yaping Zhao; Zhihao Guo

doi:10.1117/12.2548828

20 December 2019 Terahertz absorber based on graphene coating

Panpan Ren, Guanmao Zhang, Litao Qiao, Yaping Zhao, Zhihao Guo

Proceedings Volume 11209, Eleventh International Conference on Information Optics and Photonics (CIOP 2019); 112093C (2019) https://doi.org/10.1117/12.2548828
Event: Eleventh International Conference on Information Optics and Photonics (CIOP 2019), 2019, Xi'an, China

Abstract

In this paper, a terahertz absorber based on monolayer graphene is proposed. This absorber consists of a monolayer graphene and a micro-nano structure which is composed of a gold layer and silicon dioxide-silicon layer. The combination of the monolayer graphene and the simple micro-nano structure makes this absorber easy to fabrication in engineering. The introduction of the monolayer graphene also enhances the coherent superposition of incident and reflected light and results in a significant increase in the absorption of this proposed absorber. The absorber can achieve perfect absorption. When the thicknesses of gold, silicon dioxide and silicon are set to 5 um, 5.4 um, 2.3 um respectively, at the same time the incident wave is normal incidence, the maximum absorption at the absorption frequency of 5.605 THz is 0.997 and the full width at half maximum is 2.22 THz. In addition, the absorber has polarization independent and large angle absorption characteristics due to its highly symmetrical structure. These advantages make it has a great application prospect in the fields of photoelectric detection, photoelectric modulation and solar cells.

Citation Download Citation

Panpan Ren, Guanmao Zhang, Litao Qiao, Yaping Zhao, and Zhihao Guo "Terahertz absorber based on graphene coating", Proc. SPIE 11209, Eleventh International Conference on Information Optics and Photonics (CIOP 2019), 112093C (20 December 2019); https://doi.org/10.1117/12.2548828

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KEYWORDS

Absorption

Graphene

Terahertz radiation

Silicon

Gold

Metals

Silica

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