A narrow band terahertz perfect absorber based on graphene polarization independence

Tao Wang; Jiang Wei; Xu Sun; Xiaodong Jia; Ruijian Cheng

doi:10.1117/12.2673658

22 May 2023 A narrow band terahertz perfect absorber based on graphene polarization independence

Tao Wang, Jiang Wei, Xu Sun, Xiaodong Jia, Ruijian Cheng

Proceedings Volume 12640, International Conference on Internet of Things and Machine Learning (IoTML 2022); 1264018 (2023) https://doi.org/10.1117/12.2673658
Event: International Conference on Internet of Things and Machine Learning (IoTML 2022), 2022, Harbin, China

Abstract

In this paper, one kind of polarization independent terahertz perfect absorber of narrow band based on cross and open ring structure of graphene is proposed. The effects of Fermi energy level and structure size of graphene on the absorption characteristics of meta-material absorber were studied by using CST electromagnetic simulation software. The physical mechanism is explained by impedance matching theory. The results show that when the Fermi energy level of graphene is 0.5 eV, the radius of inner ring is 8 μm, the radius of outer ring is 11.5 μm, the width of cross is 1.5 μm, and the thickness of silica dielectric layer is 10 μm,, the absorber can realize 98% perfect absorption in 4.48 THz. Moreover, due to the symmetry of the structure, the absorber is independent of polarization. This result has great applications for the realization of ultra-thin tunable smart devices in the terahertz band by using patterned graphene.

Citation Download Citation

Tao Wang, Jiang Wei, Xu Sun, Xiaodong Jia, and Ruijian Cheng "A narrow band terahertz perfect absorber based on graphene polarization independence", Proc. SPIE 12640, International Conference on Internet of Things and Machine Learning (IoTML 2022), 1264018 (22 May 2023); https://doi.org/10.1117/12.2673658

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KEYWORDS

Graphene

Absorption

Terahertz radiation

Electrical conductivity

Dielectric polarization

Dielectrics

Metals

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