Fig. 1. Deposition rate of Al film under different processes

Fig. 2. Optical constants of UV-SiO₂ film

Fig. 3. ψ and Δ measurements and fitting curves of Si/ UV-SiO₂/Al/UV-SiO₂/Air samples

Fig. 4. Optical constants of Al films

Fig. 5. Optical constants of Al₂O₃ film and AlF₃ film

Fig. 6. Spectral curve of double-sided design

Fig. 7. Design and test spectral curves of filter

Fig. 8. Influence of thickness of metal layers on spectra of filter

Fig. 9. Improvement in spectral performance after debugging

Fig. 10. Surface morphology and uniform equivalent absorption layer model

Fig. 11. Optical constants of uniform equivalent absorption layer

Fig. 12. Effect of surface roughness layer on spectra

Fig. 13. Spectral curves of double-sided coating

Fig. 14. Actual image of the sample