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

IF 15.7 Q1 OPTICS PhotoniX Pub Date : 2022-04-12 DOI:10.1186/s43074-022-00057-1

Wang, He, Qin, Zhe, Huang, Lingling, Li, Yongfeng, Zhao, Ruizhe, Zhou, Hongqiang, He, Haoyang, Zhang, Jieqiu, Qu, Shaobo

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引用次数: 19

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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具有动态手性元原子的自旋复用全息图和低可观测反射的超表面

基于手性超表面的自旋光操纵是一个引人注目的热点，引起了人们的广泛关注。圆二色性是一种独特的手性原子/分子现象，被认为是引导电磁波的另一个辅助维度，在人工材料科学领域已经被探索，但也是一个具有挑战性的问题。本文提出了一种基于动态手性元原子的通用策略，以揭示微波环境下强圆二色性和适用的电磁功能。我们展示了一种动态超表面，它能够在主动工作状态下对一个圆偏振或另一个圆偏振进行完全独立的全息图重建。另一方面，通过电磁散射来降低被动状态下的可观测后向反射。通过数值模拟和实验验证了该方法的可行性。该策略有望拓宽动态手性元器件的研究领域，并在信息加密、防伪等动态系统中得到应用。

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