Metasurface with dynamic chiral meta-atoms for spin multiplexing hologram and low observable reflection

PhotoniX - 2022
He Wang1, Zhe Qin1, Lingling Huang2, Yongfeng Li1, Ruizhe Zhao2, Hongqiang Zhou2, Haoyang He2, Jieqiu Zhang1, Shaobo Qu1
1Department of Basic Sciences, Air Force Engineering University, Xi'an, 710051, Shaanxi, China
2Beijing Engineering Research Center of Mixed Reality and Advanced Display, School of Optics and Photonics, Beijing Institute of Technology, Beijing, 100081, China

Tóm tắt

Abstract

Spin light manipulation based on chiral metasurfaces is a striking hotspot that has intrigued huge attention. Circular dichroism, a unique phenomenon of chiral atoms/molecules, has been regarded as another auxiliary dimension for guiding electromagnetic waves, which has been explored in the field of artificial material sciences yet a challenging issue. Here, a generic strategy based on dynamic chiral meta-atom for revealing strong circular dichroism as well as applicable electromagnetic functionality is proposed in microwave regime. We demonstrate a dynamic metasurface that enables the fully independent holograms reconstruction for one circular polarization or the other at the active operating state. On the other hand, the electromagnetic scattering is realized for lowering observable backward reflection at the passive state. Numerical simulation and experimental verification are conducted to manifest the feasibility. It is expected that the proposed strategy can be applied to broaden the horizon for dynamic chiral meta-devices and may find applications in information encryption, anti-counterfeiting, and other dynamic systems.

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