Broadband absorber of SrTiO3 microspheres with coupling mechanism

Shaohang Xu; Chuwen Lan; Wenyu Liu; Zehua Gao

doi:10.1117/12.2673487

21 April 2023 Broadband absorber of SrTiO₃ microspheres with coupling mechanism

Shaohang Xu, Chuwen Lan, Wenyu Liu, Zehua Gao

Author Affiliations +

Proceedings Volume 12605, 2022 2nd Conference on High Performance Computing and Communication Engineering (HPCCE 2022); 1260515 (2023) https://doi.org/10.1117/12.2673487
Event: Second Conference on High Performance Computing and Communication Engineering, 2022, Harbin, China

Abstract

Metasurface-based terahertz absorbers have recently gained much attention in research on terahertz devices. However, the actual applications of such absorbers are severely constrained by issues such as difficult preparation procedures, constrained bandwidth, polarization, and incidence-angle sensitivity. This paper proposes a tunable broadband terahertz absorber scheme based on the metasurface of all-dielectric microspheres. The device consists of a single layer of strontium titanate microspheres compounded with a thin-film base. The Mie resonance of the microspheres works together with the metal film to achieve excellent absorption performance, while the modal coupling between the microspheres greatly broadens the absorption bandwidth. According to these findings, the device is capable of tunable absorption performance with a bandwidth of up to 0.18 THz. The terahertz broadband absorber proposed herein has a simple structure, superior performance, and low preparation cost, as well as potential applications in terahertz sensing, terahertz detection, and terahertz imaging.

Citation Download Citation

Shaohang Xu, Chuwen Lan, Wenyu Liu, and Zehua Gao "Broadband absorber of SrTiO₃ microspheres with coupling mechanism", Proc. SPIE 12605, 2022 2nd Conference on High Performance Computing and Communication Engineering (HPCCE 2022), 1260515 (21 April 2023); https://doi.org/10.1117/12.2673487

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KEYWORDS

Absorption

Microspheres

Terahertz radiation

Magnetism

Metals

Dielectrics

Terahertz metamaterials

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