Dual-band chiral metasurface for independent controls of spin-selective reflections

Author:

Gou Yue1,Ma Hui Feng1,Wang Zheng Xing1,Wu Liang Wei1,Wu Rui Yuan1,Cui Tie Jun1

Affiliation:

1. School of Information Science and Engineering, Southeast University

Abstract

The development of chiral metasurfaces with spin-selective reflection or transmission provides a new way to control the circularly polarized (CP) waves. However, it is still a great challenge to independently manipulate the polarization, frequency, and phase of the spin-selective reflected waves in different operating bands, which may have potential applications in improving the data capacity of microwave and optical communication systems. Here, a dual-band chiral metasurface is proposed to generate gigantic intrinsic chirality with strong circular dichroism (CD) in two different frequency bands by piecing two typical mono-chiral units together. The polarization, frequency and phase of the spin-selective reflected waves can also be independently designed in the two operating bands by adjusting the configuration of the chiral unit structures. Based on the proposed chiral structures, a dual-band chiral metasurface with spin-selective anomalous reflections is designed and demonstrated by both simulations and experiments. The results show that the polarization of spin-selective reflected waves can be customized by selecting appreciate chiral structures, while the wavefront of the spin-selective reflected waves can be further controlled by designing their arrangement.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

Six Talent Peaks Project in Jiangsu Province

111 Project

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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