Fig. 5: Aliasing in metalens.
a The three dominant diffraction channels in high NA metalens. b Diffraction diagrams in a hexagonal lattice (left) and square lattice (right) and SEM image of the fabricated metalens (insets). The inner and outer dotted circles represent the spectral boundary having NA 0.99 and 0.65. c, d The measured intensity distribution of diffracted light after transmitting (c) the hexagonal lattice and (d) square lattice metalens with an NA of 0.99. e, f The measured intensity distribution of diffracted light after transmitting (e) the hexagonal lattice and (f) square lattice metalens with an NA of 0.65.
