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

1.
Department of Basic Sciences, Air Force Engineering University, Xi’an, 710051, Shaanxi, China
2.
Beijing Engineering Research Center of Mixed Reality and Advanced Display, School of Optics and Photonics, Beijing Institute of Technology, Beijing, 100081, China

Funds: This work is sponsored by the National Key Research and Development Program of China (2021YFA1401200), Ministry of Science and Technology; the National Natural Science Foundation of China (Grant Nos. 61971437, 92050117, U21A20140); the Beijing Outstanding Young Scientist Program (Grant No. BJJWZYJH01201910007022); the Natural Science Foundation of Shaanxi Province (Grant No.2020JM-342).

摘要

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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参考文献(43)

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