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Nonclassical Spin-Multiplexing Metasurfaces Enabled Multifunctional Meta-Scope
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DOI：10.1002/smll.202404003.png)
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Dielectric metasurfaces have emerged as attractive devices for advanced imaging systems because of their high efficiency, ability of wavefront manipulation, and lightweight. The classical spin-multiplexing metasurfaces can only provide two orthogonal circular polarization channels and require high phase contrast which limits their applications. Here, metasurfaces with arbitrary three independent channels are demonstrated by proposing a nonclassical spin-multiplexing approach exploring the low refractive index meta-atoms. A zoom microscope with on-axis tri-foci and a synchronous achiral-chiral microscope with in-plane tri-foci based on silicon nitride metasurfaces are experimentally demonstrated. Based on the on-axis tri-foci metasurface, singlet zoom imaging with three magnifications and a broadband response (blue to red) based on a single metasurface is first demonstrated. A compact microscope (meta-scope) consisting of two metasurfaces with three magnifications of 9.5, 10, and 29X with diffraction-limited resolutions is further constructed, respectively. Utilizing the in-plane tri-foci metasurface, a singlet microscope with three achiral-chiral channels is demonstrated. It offers a magnification of 53X and a diffraction-limited resolution, enabling simultaneous imaging of an object's achiral and chiral properties. Our multifunctional metasurfaces and meta-scope approaches could boost the applications in biological imaging and machine vision. While the classical spin-multiplexing dielectric metasurfaces require a high-refraction-index material and can only achieve two orthogonally circular polarisation channels, a nonclassical spin-multiplexing approach is developed for achieving tri-channel metasurfaces via a low-refraction-index material in this paper. In experiments, an inherent zoom meta-scope and a simultaneously achiral and chiral meta-scope are demonstrated. image
Keyword:
metalens
meta-scope
metasurfaces
multiple foci
optical microscopy
期刊
IF:
12.1
论文数:
3.0W
被引数:
16.4W
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