A Spacer-Thickness Tunable Terahertz Metasurface Absorber for Wide-Angle and Polarization-Insensitive Operation

Document Type : Original Article

Authors

Laser and Plasma Research Institute, Shahid Beheshti University, Tehran, Iran

Abstract

Terahertz metasurfaces show great potential for communications, sensing, and imaging, but are often limited by complex designs, sensitivity to polarization and incident angle, and lack of tunability. This work addresses these challenges with a simple, compact, and efficient design. We design a terahertz metasurface perfect absorber with dual frequency selectivity and good incident angle compatibility using a gallium-doped ZnO resonator microring array separated from a copper ground plane by a GaAs spacer. CST software 2021 was used to simulate the absorption properties of terahertz waves (0.1-10 THz). Simulations reveal two selective absorption peaks with absorption of 99.68% at 2.4463 THz and 99.84% at 7.8418 THz. The four-fold rotational symmetry ensures polarization insensitivity and stable performance across a broad range of incidence angles from 0° to 60°. Importantly, tuning the spacer thickness allows predictable adjustment in the number of absorption peaks without altering the resonator geometry. This versatile, easy-to-fabricate platform paves the way for economical and reliable terahertz devices like absorbers, filters, modulators, and sensors.

Keywords

Pioneering Advances in Materials
Volume 1, Issue 2
April 2026
Pages 37-45

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