Fig. 1. Color filter based on rectangular metal block array structure, and its dispersion relationship and transmission spectra. (a) Three-dimensional structural diagram; (b) dispersion curve of TM/TE waveguide mode for asymmetric waveguide film composed of MgF₂, Si₃N₄, and air; (c) transmission spectra for conditions: P_x=300 nm， P_y=400 nm； P_x=400 nm， P_y=500 nm； P_x=500 nm， P_y=350 nm

Fig. 2. Effects of color filter structural parameters H₁, H₂, H₃, f_x, and f_y on transmission spectra for TM polarization state, P_x=400 nm， and P_y=300 nm. (a) H₁ is 60‒140 nm; (b) H₂ is 0‒50 nm; (c) H₃ is 20‒60 nm; (d) when f_y=0.7, f_x is 0.5‒0.9; (e) when f_x=0.7, f_y is 0.5‒0.9

Fig. 3. Influence of φ on transmission spectrum and its chromaticity coordinate diagram of color filter for P_x≠P_y. (a) Transmission spectrum under different φ for P_x=300 nm and P_y=400 nm; (b) CIE1931 chromaticity diagram corresponding to Fig. 3(a); (c) transmission spectrum under different φ for P_x=300 nm and P_y=500 nm; (d) CIE1931 chromaticity diagram corresponding to Fig. 3(c); (e) transmission spectrum under different φ for P_x=300 nm and P_y=600 nm; (f) CIE1931 chromaticity diagram corresponding to Fig. 3(e)

Fig. 4. Influence of φ on electric field distribution of rectangular metal block in x-y plane when P_x≠P_y. (a)‒(c) P_x=300 nm, P_y=400 nm; (d)‒(f) P_x=300 nm, P_y=500 nm; (g)‒(i) P_x=300 nm, P_y=600 nm

Fig. 5. Influence of P_y on transmission spectrum and its chromaticity coordinate diagram of color filter when P_x and φ are fixed. (a) Transmission spectra for P_x=300 nm and φ=0° when P_y is 300‒600 nm; (b) CIE1931 chromaticity diagram corresponding to Fig. 5(a); (c) transmission spectra for P_x=500 nm and φ=0° when P_y is 300‒600 nm; (d) CIE1931 chromaticity diagram corresponding to Fig. 5(c)

Fig. 6. All-optical control achieved by three different sizes of filters with rectangular metal block array structure. (a) Transmission spectra under different polarization angles (Ⅰ： P_x=300 nm， P_y=400 nm； Ⅱ: P_x=400 nm， P_y=500 nm; Ⅲ:P_x=500 nm， P_y=300 nm); (b） three-dimentional structures of filters with different sizes corresponding to Fig. 6(a); (c) CIE1931 chromaticity diagram corresponding to Fig. 6(a)