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- W4310626928 abstract "Metalenses -- flat lenses made with optical metasurfaces -- promise to enable thinner, cheaper, and better imaging systems. Achieving a sufficient angular field of view (FOV) is crucial toward that goal and requires a tailored incident-angle-dependent response. Here, we show that there is an intrinsic trade-off between achieving a desired broad-angle response and reducing the thickness of the device. It originates from the Fourier transform duality between space and angle. One can write down the transmission matrix describing the desired angle-dependent response, convert it to the spatial basis where its degree of nonlocality can be quantified through a lateral spreading, and determine the minimal device thickness based on such a required lateral spreading. This approach is general. When applied to wide-FOV lenses, it predicts the minimal thickness as a function of the FOV, lens diameter, and numerical aperture. The bound is tight, as some inverse-designed multi-layer metasurfaces can approach the minimal thickness we found. This work offers guidance for the design of nonlocal metasurfaces, proposes a new framework for establishing bounds, and reveals the relation between angular diversity and spatial footprint in multi-channel systems." @default.
- W4310626928 created "2022-12-13" @default.
- W4310626928 creator A5003682069 @default.
- W4310626928 creator A5059265428 @default.
- W4310626928 date "2022-12-01" @default.
- W4310626928 modified "2023-10-16" @default.
- W4310626928 title "Thickness bound for nonlocal wide-field-of-view metalenses" @default.
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- W4310626928 doi "https://doi.org/10.1038/s41377-022-01038-6" @default.
- W4310626928 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36456552" @default.
- W4310626928 hasPublicationYear "2022" @default.
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