Fig. 7

Color focusing imaging applications of metalenses. (a) Left panel: SEM of a region of the fabricated metalens [78]. Scale bar: 500 nm. Middle panel: Image of SUSAFRC using the achromatic metalens under an illumination bandwidth of 200 nm centered at 570 nm. Right panel: Image of the Siemens star pattern under the same illumination condition in (b). Scale bars: 200 μm. (b) Images of SUSAFRC taken by the achromatic metalens [78]. Scale bar: 100 μm. (c) Optical image of the fabricated achromatic metalens. The dashed squares indicate the position of the SEM images shown below [79]. Scale bar: 10 μm. (d) Upper panel: image of SUSAFRC taken from achromatic and chromatic metalenses. Scale bars: 4 μm. Lower panel: captured images of full-colour Alcedinidae, Erithacus rubecula and Eurasian eagle owl images by the achromatic metalens before and after color correction [79]