Research on the optical characteristics of tunable vanadium dioxide terahertz metamaterial absorbers

Hengli Feng; Hongyan Meng; Yachen Gao

doi:10.1117/12.3039268

13 September 2024 Research on the optical characteristics of tunable vanadium dioxide terahertz metamaterial absorbers

Hengli Feng, Hongyan Meng, Yachen Gao

Proceedings Volume 13254, Fourth International Conference on Optics and Image Processing (ICOIP 2024); 1325406 (2024) https://doi.org/10.1117/12.3039268
Event: Fourth International Conference on Optics and Image Processing (ICOIP 2024), 2024, Chongqing, China

Abstract

A tunable wideband terahertz absorber based on vanadium dioxide (VO₂) has been proposed, and its optical characteristics have been studied. The absorber structure is comprised of three layers, which includes a VO₂ metasurface layer, a silicon dioxide (SiO₂) dielectric layer, and a gold substrate. The structure of this VO₂ metasurface consists of symmetrically distributed square perforated VO₂ resonators with circular holes, with a relative dielectric constant δ < 3.8 for the SiO₂ dielectric layer and a conductivity 4.56 10⁵ S/m 5 ≥ for the gold substrate. We studied the optical characteristics of the absorber through simulations and theoretical calculations employing the Finite-Difference Time-Domain (FDTD) technique. It was found that, while the VO2 is in the metallic phase, the absorber demonstrates a superior absorption spectrum, achieving a high absorptivity of 90% across a frequency range from 2.2 THz to 4.0 THz, with the absorption bandwidth reaching up to 1.8 THz. The absorptance for two peaks at 2.7 THz and 3.4 THz reaches 99% and 100%, respectively. When VO2 transitions to its dielectric state, its absorptance can be adjusted in a dynamic manner from 100% to 20%, achieving almost perfect amplitude modulation. The physical mechanism of wideband absorption is elucidated using electric field distribution and tunable absorption is verified using impedance matching theory. Besides, it displays insensitivity to variations in the angle of incident light polarization and maintains absorption stability under oblique incidence. This absorber exhibits excellent absorption performance, and the research and application of terahertz devices have opened up new frontiers.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Hengli Feng, Hongyan Meng, and Yachen Gao "Research on the optical characteristics of tunable vanadium dioxide terahertz metamaterial absorbers", Proc. SPIE 13254, Fourth International Conference on Optics and Image Processing (ICOIP 2024), 1325406 (13 September 2024); https://doi.org/10.1117/12.3039268

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KEYWORDS

Absorption

Terahertz radiation

Electrical conductivity

Gold

Dielectrics

Vanadium

Reflection

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