Fig. 1. Schematic of fabrication process for structural color samples by laser post-treatment

Fig. 2. Principles of coloration by Si/ SiO₂/PS composite structure

Fig. 3. Schematic of multilayer film interference

Fig. 4. Reflection spectra of samples changing with coating time and laser scanning speed.(a) 20 s;(b) 80 s;(c) 120 s

Fig. 5. Chromaticity coordinates of samples at different coating times and laser scanning speeds

Fig. 6. Influence of coating time and scanning speed on spectral reflection of samples.(a) 50 mm/s; (b) 200 mm/s

Fig. 7. Microtopography of samples. (a) 20 s 50 mm/s; (b) 20 s 200 mm/s; (c) 80 s 50 mm/s; (d) 80 s 200 mm/s; (e) 120 s 50 mm/s; (f) 120 s 200 mm; cross section image (g) 80 s 30 mm/s, (h) 80 s 80 mm/s, (i) 80 s 140 mm/s

Fig. 8. Spectral reflection curve and chromaticity coordinate diagram of samples before and after adding SiO₂ layer. (a) Spectral reflection curve; (b) chromaticity coordinate diagram

Fig. 9. SEM images of samples before and after adding SiO₂ layer at different scanning speeds. (a) Si substrate 80 s 50 mm/s; (b) SiO₂ substrate 80 s 50 mm/s; (c) Si substrate 80 s 200 mm/s; (d) SiO₂ substrate 80 s 200 mm/s