Fig. 1. Theoretical model of moth-eye structure. (a) Three-dimensional structural model; (b) schematic of simulation model

Fig. 2. Relationship between broadband transmissivity and moth-eye structural parameters. (a) Varying period; (b) varying bottom diameter; (c) varying height; (d) varying top diameter

Fig. 3. Relationship between wide-angle transmissivity and moth-eye structural parameters. (a) Varying period (D=400 nm, H=1000 nm, d=50 nm); (b) varying bottom diameter (Λ=1000 nm, H=1000 nm, d=50 nm); (c) varying height (Λ=1000 nm, D=400 nm, d=50 nm); (d) varying top diameter (Λ=1000 nm, D=400 nm, H=1000 nm)

Fig. 4. Electric field distributions of moth-eye structure under different wavelengths and incident angles. (a) 0.727 μm (i 0°, ii 30°, iii 60°); (b) 1.568 μm (i 0°, ii 30°, iii 60°); (c) 2.151 μm (i 0°, ii 30°, iii 60°)

Fig. 5. Optical property comparison of moth-eye and flat structural arrays after optimization. (a) Transmissivity spectra of flat ZnS MS and optimized ZnS MS moth-eye structure; (b) distribution of transmissivity of optimized moth-eye structure versus incident angle and wavelength (Λ=1000 nm、D=1000 nm、H=1500 nm and d=50 nm)