Fig. 1: Aplanatic metalens design.
a Phase profiles designed for a normal (blue) and an aplanatic (red) metalens. b Spherical aberration (Δs′) of the normal and aplanatic metalenses as a function of the numerical aperture (NA), where the inset figures are the corresponding ray tracing results with a lens NA = 0.78 as an example. c Normalized spherical aberration (Δs′/s′) as a function of the NA and wavelength, showing the broadband performance. d,e Full-wave simulation results of the point-source imaging with the normal and aplanatic metalenses, respectively
