Fig. 1. Schematics of 3D simulation model. (a) Cylindrical structure; (b) conical structure; (c) moth-eye structure

Fig. 2. Equivalent refractive index curves of three different structures

Fig. 3. Reflectance curves of three structures under different parameters. (a) ϕ=200 nm,γ=0.5; (b) ϕ=200 nm,γ=1.0; (c) ϕ=200 nm,γ=1.5; (d) ϕ=300 nm,γ=0.5; (e) ϕ=300 nm,γ=1.0; (f) ϕ=300 nm,γ=1.5; (g) ϕ=500 nm,γ=0.5; (h) ϕ=500 nm,γ=1.0; (i) ϕ=500 nm,γ=1.5

Fig. 4. Reflectance curves of moth-eye structures under different ϕ. (a) ϕ=200 nm; (b) ϕ=300 nm

Fig. 5. Equivalent refractive indices under different x. (a) Wide x range; (b) narrow x range

Fig. 6. Schematic of microstructure parameters

Fig. 7. Designed cone-like structures. (a1)(a2) Hexagonal pyramid structure; (b1)(b2) tetragonal pyramid structure; (c1)(c2) triangular pyramid structure

Fig. 8. Equivalent refractive index curves of different structures

Fig. 9. Average reflectance when ϕ=200 nm

Fig. 10. Reflectance curves when ϕ=200 nm. (a) γ=1.0; (b) γ=1.5; (c) γ=2.0; (d) γ=2.5

Fig. 11. Average reflectance curves of four microstructures under different ϕ. (a) ϕ=300 nm; (b) ϕ=500 nm

Fig. 12. Wide-angle reflectance curves of four microstructures under different λ. (a) λ= 500 nm; (b) λ= 850 nm

Fig. 13. Electric field intensity distributions of two structures. (a) Cone-like structure; (b) moth-eye structure