Fig. 7
From: Recent advancements of metalenses for functional imaging
Monochromatic aberration compensation lens: a Schematic of metalens doublet. A metalens is present on both sides of the glass substrate. The meta-atoms of each lens have the same width, height, and length but have different angles. b Light incident from different angles forms images on the same image plane, with aberrations being compensated by an aperture metalens and a focusing metalens. c Schematic diagram of metalens doublet’s imaging setup and images for each angle of incidence (scale bar: 11 μm). a-c are reproduced with permission [129] (Copyright 2017, American Chemical Society). d Schematic diagram of an ultrawide-angle lens with an aperture and a metalens. e (top) Tilted view of a rectangular and an H-shaped meta-atom. (bottom left) Phase delay according to angle of incidence for each meta-atom shape. (bottom right) Metalens phase profile, where the black dashed circle indicates the aperture stop position and size. f SEM images of fabricated metalens. g Projected images of the 1951 USAF resolution test target with a period of 13.9 μm. d-g are reproduced with permission [130] (Copyright 2020, American Chemical Society). h Schematic and SEM images of polarization-insensitive metalens (scale bars: (center) 100 μm and (top- and bottom-right) 1 μm. Reproduced with permission [131] (Copyright 2015, Springer Nature)