Liquid crystal embedded dielectric metalens for active focal length tuning at the microwave range

Zhixiong Shen; Shijun Ge; Wei Hu

doi:10.1117/12.2644395

23 January 2023 Liquid crystal embedded dielectric metalens for active focal length tuning at the microwave range

Zhixiong Shen, Shijun Ge, Wei Hu

Proceedings Volume 12556, AOPC 2022: Optoelectronics and Nanophotonics; 125560D (2023) https://doi.org/10.1117/12.2644395
Event: Applied Optics and Photonics China 2022 (AOPC2022), 2022, Beijing, China

Abstract

We propose and demonstrate a liquid crystal (LC) embedded dielectric metalens with continuously tunable focal length operating at 35 GHz. The lens is composed of a dielectric square hole array filled with a homogenously pre-aligned LC layer. The orientation of LCs can be electrically or magnetically varied, resulting in the dynamic tuning of the transmitted phase of the meta-unit. By elaborately designing the dimension of each meta-unit, the metalens can focus the wave with a variable focal length. We numerically demonstrate a metalens with its focal length tuning from 196.1 to 166.5 mm when the LC orientation gradually varies from 0° to 90°. The transmission of each meta-unit and the full width at half maximum of the focusing intensity are also analyzed, indicating an efficient and satisfactory focusing property. Such a compact and tunable metadevice may facilitate the microwave imaging, communication and so on.

Citation Download Citation

Zhixiong Shen, Shijun Ge, and Wei Hu "Liquid crystal embedded dielectric metalens for active focal length tuning at the microwave range", Proc. SPIE 12556, AOPC 2022: Optoelectronics and Nanophotonics, 125560D (23 January 2023); https://doi.org/10.1117/12.2644395

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