Fig. 2

Design and simulation of metalens. a Schematic of anisotropic meta-atom. b Simulated conversion efficiencies of meta-atoms at λ = 532 nm. (height = 700 nm, period = 450 nm) c Real part of electric field in designed meta-atom: x-component (left) and y-component (right). d Plot of conversion efficiencies in the visible wavelength range. e Simulated optical field based on the Rayleigh–Sommerfeld diffraction formula at wavelength of 450 nm (left), 532 nm (center), and 635 nm (right)