Figure 3.
Focusing characteristics of UV metalense at incident UV light 250–400 nm. Normalized intensity distribution at y-z plane at (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-y plane at x = y = 0. (e) λ = 250 nm along x-axis at z = 5.3 µm, (f) λ = 300 nm, along x-axis at z = 4.4 µm (g) λ = 350 nm, along x-axis at z = 3.5 µm and (h) λ = 400 nm, along x-axis at z = 2.9 µm. The metalens has a diameter of 10 µm, the numerical aperture (NA) of the metalens at designed wavelength λd = 300 nm is 0.75.