Fig. 6: Three types of configurations for aplanatic imaging.
From: Dielectric metalens for miniaturized imaging systems: progress and challenges

a Singlet aplanatic metalens. b Chevalier Landscape metalens. c Doublet aplanatic metalens
From: Dielectric metalens for miniaturized imaging systems: progress and challenges
a Singlet aplanatic metalens. b Chevalier Landscape metalens. c Doublet aplanatic metalens