Nonclassical spin-multiplexing metasurfaces enabled multifunctional meta-scope

Abstract

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 could only provide two orthogonal circular polarization channels and require high phase contrast which limits their applications. Here, we demonstrated metasurfaces with arbitrary three independent channels by proposing a non-classical spin-multiplexing approach exploring the low refractive index meta-atoms. We experimentally demonstrated a zoom microscope with on-axis tri-foci and a synchronous achiral-chiral microscope with in-plane tri-foci based on silicon nitride metasurfaces, respectively. Based on the on-axis tri-foci metasurface, we first demonstrated singlet zoom imaging with three magnifications and a broadband response (blue to red) based on a single metasurface. We further constructed a compact microscope (meta-scope) consisting of two metasurfaces with three magnifications of 9.5X, 10X, and 29X with diffraction-limited resolutions, respectively. Utilizing the in-plane tri-foci metasurface, a singlet microscope with three achiral-chiral channels has been demonstrated. It offers a magnification of 53X and a diffraction-limited resolution, enabling simultaneous imaging of an object's achiral and chiral properties. We conceive that our multifunctional metasurfaces and meta-scope approaches would boost the applications in biological imaging and the machine vision.

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Identifiers

ORCID for Chuang Sun: orcid.org/0000-0001-7024-1916

ORCID for Kian Shen Kiang: orcid.org/0000-0002-7326-909X

ORCID for Jize Yan: orcid.org/0000-0002-2886-2847

ORCID for Bruce (Jun-Yu) Ou: orcid.org/0000-0001-8028-6130

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