Figure 2:

Design, simulation, and SEM visualization of fabricated metalens. (a) Transmission and (b) phase diagrams versus different heights and radii at a wavelength of λ = 940 nm. The dashed lines show the selected height and radii of nano-pillars. (c) The unit cell structure of the metalens. The nano-pillars are designed in a square lattice with a unit cell period of P = 400 nm. The imparted phase by a nano-pillar is managed by its diameter (D = 100–324 nm). (d) Transmission and phase diagram versus radius at 490 nm nano-pillar height. (e) Fabricated metalens and SEM images.