Fig. 4
From: A broadband achromatic polarization-insensitive metalens consisting of anisotropic nanostructures
Simulated results for a polarization-insensitive phase-gradient metasurface. a Layout of the designed metasurface. The metasurface consists of mutually parallel and perpendicular nanofins with the geometries and orientations chosen to deflect a normal incident beam to an angle of 15 degrees at the design wavelength of 530 nm. The bottom panel shows the target and realized phases in a black line and blue circles, respectively. b Normalized far-field power under x-polarized incidence as a function of incident wavelength and diffraction angles. c Diffraction efficiency (colors) for the metasurface across the visible spectrum under linear and circular polarizations. The polarization angles are labelled on the y-axis, while the last two rows showing the cases for right- and left-handed polarizations. For all wavelengths, the efficiency is maintained at a relatively constant value, which is indicative of polarization insensitivity
