Journal
LASER & PHOTONICS REVIEWS
Volume 15, Issue 11, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.202100198
Keywords
all-dielectric metasurfaces; metalens; multi-focal; polarization-switchable
Categories
Funding
- National Natural Science Foundation of China [52005175]
- Natural Science Foundation of Hunan Province of China [2020JJ505, 2019JJ500979]
- Shenzhen Science and Technology Program [RCBS20200714114855118]
- Youth Innovation Promotion Association of the Chinese Academy of Sciences [2017429]
- Program of Huxiang Young Talents [2018RS3099]
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This paper proposes all-dielectric noninterleaved metalenses with polarization-switchable multi-focal points, in which each rectangular nanopillar has independently switchable multiple focal points. By fully utilizing the polarization freedom, independently switchable focal points at any spatial position are achieved, with near-zero crosstalk between orthogonal polarization channels.
Multi-focal lenses are widely applied in zoom imaging, parallel laser processing, 3D displays, among others. However, conventional refractive or diffractive elements cannot realize independently switchable multi-focal points at arbitrary spatial positions. The ultra-thin metasurface provides a compact solution while the commonly used interleaved meta-units scheme deteriorates the performance of the meta-devices. Here the authors propose all-dielectric noninterleaved metalenses with polarization-switchable multi-focal points. By fully using the degrees of freedom of the single rectangular nanopillar, up to three independently switchable focal points at any spatial position can be realized in a metalens with a single-structure lattice. With the near-zero crosstalk between orthogonal polarization channels, polarization detection, zoom imaging, variable-parameter phase detection, and parallel laser lithography are demonstrated. The multichannel scheme by fully utilizing the polarization freedom paves the way for various multifunctional components.
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