Fig. 4: Efficiency and intensity sweeps of forward designed lenses and optimized lenses.
From: Large area optimization of meta-lens via data-free machine learning
a Focal spot intensity profile of a forward designed lens with focal length F = 500μm. b Focal spot intensity profile of an optimized lens. c Slices of intensity profiles for both lenses. The intensity was normalized such that the maximum intensity of the forward designed lens is 1. The theoretical performance improvement is ~3%. d Maximum intensity at the focal spot vs lens numerical aperture (NA). Intensities are normalized such that the maximum of the largest forward designed intensity is set to 1. e Theoretically computed efficiencies of the lenses vs NA. The solid lines are visual aids for the trend and do not correspond to a theoretical prediction.
