Optically transparent microwave perfect absorber based on metamaterial structure

Shidong Xu; Chinhua Wang

doi:10.1117/12.2644359

9 September 2022 Optically transparent microwave perfect absorber based on metamaterial structure

Shidong Xu, Chinhua Wang

Proceedings Volume 12328, Second International Conference on Optics and Image Processing (ICOIP 2022); 1232806 (2022) https://doi.org/10.1117/12.2644359
Event: Second International Conference on Optics and Image Processing (ICOIP 2022), 2022, Taian, China

Abstract

We propose and analyze an optically transparent microwave perfect absorber which is based on a metamaterial structure. The absorber consists of a layer of a high-square impedance ITO film and a resonant cavity that provides zero phase and total reflection. The resonant cavity is formed by a metal grid structure on the upper surface of a transparent polyethylene terephthalate (PET) and a metal grid on the bottom surface as the ground. Almost perfect absorption could be achieved because of the interference phase extinction within the high-square resistance ITO film. In order to achieve optical transparency in the visible range, PET film is used as the substrate with a grid-like metallic pattern. Absorption of higher than >90% from 13.88-16.92 GHz and average optical transmittance of ~83% in the visible-near-infrared (400-1400 nm) are achieved both theoretically and experimentally. The suggested approach and structure provides a way to realize an optically transparent microwave absorber which is of significance in real applications.

Citation Download Citation

Shidong Xu and Chinhua Wang "Optically transparent microwave perfect absorber based on metamaterial structure", Proc. SPIE 12328, Second International Conference on Optics and Image Processing (ICOIP 2022), 1232806 (9 September 2022); https://doi.org/10.1117/12.2644359

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KEYWORDS

Absorption

Metals

Microwave radiation

Metamaterials

Copper

Reflection

Positron emission tomography

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