A polarization-insensitive and angle-insensitive tunable terahertz absorber with graphene

Mengyao Yan; Dongfang Zhou; Ziyue Wang; QiKun Liu; Zheng Wan; Chenge Bian; Guanghui Sun

doi:10.1117/12.2689112

31 July 2023 A polarization-insensitive and angle-insensitive tunable terahertz absorber with graphene

Mengyao Yan, Dongfang Zhou, Ziyue Wang, QiKun Liu, Zheng Wan, Chenge Bian, Guanghui Sun

Proceedings Volume 12747, Third International Conference on Optics and Image Processing (ICOIP 2023); 127470I (2023) https://doi.org/10.1117/12.2689112
Event: Third International Conference on Optics and Image Processing (ICOIP 2023), 2023, Hangzhou, China

Abstract

In this paper, we propose a metamaterial absorber based on a composite structure of graphene and silicon dioxide (SiO2) for the terahertz (THz) region. The structure includes a gold ground and a graphene layer separated by the dielectric layers of silicon dioxide. The absorber is designed to be insensitive to angles and polarization. The full-wave simulation shows that the designed graphene absorber has an absorption rate of over 99.8% at 2.9 THz. The perfect absorption properties can be dynamically modified by adjusting the chemical potential of graphene. Furthermore, the absorber has robust tolerance for oblique incidence and is also insensitive to polarization. Additionally, we conducted an analysis to determine whether the graphene absorber satisfies the impedance matching condition, thereby improving our understanding of the physical mechanism behind the perfect absorption. Because of its simple structure, flexible tunability, and promising performance, the proposed absorber has the potential for applications in developing graphene-based terahertz energy harvesting, modulators, and other areas.

Citation Download Citation

Mengyao Yan, Dongfang Zhou, Ziyue Wang, QiKun Liu, Zheng Wan, Chenge Bian, and Guanghui Sun "A polarization-insensitive and angle-insensitive tunable terahertz absorber with graphene", Proc. SPIE 12747, Third International Conference on Optics and Image Processing (ICOIP 2023), 127470I (31 July 2023); https://doi.org/10.1117/12.2689112

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KEYWORDS

Graphene

Absorption

Gold

Terahertz radiation

Silica

Design and modelling

Electromagnetic radiation

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