Fig. 1. Schematic diagrams of color filter with all-dielectric ring-nanorod structure. (a) Silicon ring-nanorod array structure; (b) single ring-nanorod structure unit

Fig. 2. Comparison of reflectance spectra, structure colors, and electric field distributions of three different structures. (a) Spectral comparison diagrams of nanorods（1）, nanorings（2）, and silicon ring-nanorod structures（3）; (b) corresponding CIE1931 chromaticity coordinate diagram; (c)-(e) X-Z section electric field intensity distribution diagrams corresponding to reflection peaks of three structures

Fig. 3. Influence of d1 and h on reflection spectra and chromaticity coordinate diagrams of color filter. (a) d₁ is 60-140 nm; (b) CIE1931 chromaticity coordinate diagram corresponding to Fig. 3(a); (c) h is 80-120 nm ; (d) CIE1931 chromaticity coordinate diagram corresponding to Fig. 3(c)

Fig. 4. Influence of different d2 and P on reflection spectrum and its chromaticity coordinate diagrams of color filter. (a) d₂=240-320 nm; (b) CIE1931 chromaticity coordinate diagram corresponding to Fig. 4(a); (c) P=320-400 nm; (d) CIE1931 chromaticity coordinate diagram corresponding to Fig. 4(c)

Fig. 5. Performance comparison before and after structural parameter optimization. (a) Reflectance spectrum after structural optimization when d₁ is 60-140 nm; (b) comparison of CIE1931 chromaticity coordinate diagram before and after structural optimization