Figure 6.

Focusing characteristics of UV metalens at 250–400 nm at different incident angles. Normalized intensity distribution at x-z plane at an incident angle of 5° (a) λ = 250 nm, (b) λ = 300 nm, (c) λ = 350 nm and (d) λ = 400 nm. Normalized intensity distribution of the metalens at x-z plane at an incident angle of 15° (e) λ = 250 nm, (f) λ = 300 nm (g) λ = 350 nm and (h) λ = 400 nm. Normalized intensity distribution at x-z plane at an incident angle of 25° (i) λ = 250 nm (j) λ = 300 nm (k) λ = 350 nm and (l) λ = 400 nm