Fig. 16. Metalenses for single-shot 3D imaging.

a Layout scheme of the spatially interleaved metalenses with the zoomed-out false-colored SEM (left), and the comparison of imaging results (right). Reproduced with permission¹⁶². Copyright 2019, American Chemical Society. b A depth sensor based on a metalens simultaneously capturing two images with different defocus, insets are enlarged view of false-colored design (top) and side-view SEM image (bottom). In the right figure, meta-atoms with different colors correspond to distinct focusing phase profiles of the interleaved lenses. Reproduced with permission¹⁶³. Copyright 2019, National Academy of Sciences. c Schematic configuration of the VMMA for TE/TM beam and the corresponding transmission phase profile (left); reconstructed depth-slice images for incidence with one and two polarizations (right). Reproduced with permission¹⁶⁴. Copyright 2020, Wiley-VCH. d Schematic of 3D imaging with a double-helix-PSF rotating with the object distances (left) and the experimental result: photo of a 3D scene (middle), raw image (top in the right), and the retrieved depth information (bottom in the right). Reproduced with permission¹⁶⁵. Copyright 2019, The Authors. Published by SPIE