Electrically switchable 2N-channel wave-front control for certain functionalities with N cascaded polarization-dependent metasurfaces

Zhiyao Ma, Tian Tian, Yuxuan Liao, Xue Feng (), Yongzhuo Li, Kaiyu Cui, Fang Liu, Hao Sun, Wei Zhang and Yidong Huang ()
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Zhiyao Ma: Tsinghua University
Tian Tian: Tsinghua University
Yuxuan Liao: Tsinghua University
Xue Feng: Tsinghua University
Yongzhuo Li: Tsinghua University
Kaiyu Cui: Tsinghua University
Fang Liu: Tsinghua University
Hao Sun: Tsinghua University
Wei Zhang: Tsinghua University
Yidong Huang: Tsinghua University

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Metasurfaces with tunable functionalities are greatly desired for modern optical system and various applications. To increase the operating channels of polarization-multiplexed metasurfaces, we proposed a structure of N cascaded dual-channel metasurfaces to achieve 2N electrically switchable channels without intrinsic loss or cross-talk for certain functionalities, including beam steering, vortex beam generation, lens, etc. As proof of principles, we have implemented a 3-layer setup to achieve 8 channels. In success, we have demonstrated two typical functionalities of vortex beam generation with switchable topological charge of l = −3 ~ +4 or l = −1 ~ −8, and beam steering with the deflection direction switchable in an 8×1 line or a 4×2 grid. We believe that our proposal would provide a practical way to significantly increase the scalability and extend the functionality of polarization-multiplexed metasurfaces. Although this method is not universal, it is potential for the applications of LiDAR, glasses-free 3D display, OAM (de)multiplexing, and varifocal meta-lens.

Date: 2024
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DOI: 10.1038/s41467-024-52676-w

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