Fig. 1. Schematic diagram of double-layer cross circle filter and its unit structure

Fig. 2. Comparison of transmittance and electro-magnetic field distribution of four different structures. (a) Comparison of transmittance curves, full widths at half maximum, and Q values of different structures; (b) xy-plane electro-magnetic field of double-layer cross circle structure; (c) xy-plane electro-magnetic field of single-layer cross circle structure

Fig. 3. Transmission spectra and colorimetry diagrams of different structural periods. (a) L₁=360 nm, varying W₁; (b) W₁ and L₁ varying simultaneously and W₁=L₁; (c) W₁=360 nm, varying L₁

Fig. 4. Transmission spectra and chromaticity diagrams of color filter corresponding to variation of cross width B₁ and ring width R₁. (a) Cross width B₁; (b) ring width R₁

Fig. 5. Transmission spectra and chromaticity diagrams of color filter corresponding to variation of polarization angle under different structural periods. (a) W₁=400 nm, L₁=380 nm; (b) W₁=430 nm, L₁=390 nm

Fig. 6. Transmittance spectrum for incident angle from 0 to 30°