Pixel-level phase-controllable multifunctional metalenses

Dapeng Zhang; Fei Zhang; Mingbo Pu; Yinghui Guo; Mingfeng Xu; Kaipeng Liu; Xiangang Luo

doi:10.1117/12.3023692

18 March 2024 Pixel-level phase-controllable multifunctional metalenses

Dapeng Zhang, Fei Zhang, Mingbo Pu, Yinghui Guo, Mingfeng Xu, Kaipeng Liu, Xiangang Luo

Proceedings Volume 13104, Advanced Fiber Laser Conference (AFL2023); 131045Q (2024) https://doi.org/10.1117/12.3023692
Event: Advanced Fiber Laser Conference (AFL2023), 2023, Shenzhen, China

Abstract

Simultaneously achieving a large field of view (FOV) and high-resolution imaging has always been the goal in the design of optical systems. Although traditional optical systems can switch from large-FOV to high-resolution imaging by adjusting the focal length, this method relies on complex mechanical structures and multi-lens combinations, leading to slow switching speed and bulky volume. Planar metasurfaces composed of subwavelength structures can achieve arbitrary wavefront manipulation, but their phase distributions are usually fixed once fabricated. In this paper, we propose a strategy for large-scale pixel-level active control of local phase on demand via cascaded bilayer metasurfaces. This method enables fast switching between the quadratic phase and hyperbolic phase by globally translating one of two layers at a one-lattice interval. Simulation results indicate that the full FOV for the quadratic phase exceeds 80°, and the point spread functions for the hyperbolic phase at various focal lengths closely approach the diffraction limit. Such multifunctional metalenses may find many potential applications, such as surveillance, unmanned vehicles, and medical science.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Dapeng Zhang, Fei Zhang, Mingbo Pu, Yinghui Guo, Mingfeng Xu, Kaipeng Liu, and Xiangang Luo "Pixel-level phase-controllable multifunctional metalenses", Proc. SPIE 13104, Advanced Fiber Laser Conference (AFL2023), 131045Q (18 March 2024); https://doi.org/10.1117/12.3023692

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KEYWORDS

Imaging systems

Metalenses

Point spread functions

Phase distribution

Phase shift keying

Diffraction limit

Phase modulation

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