Fig. 1. Calculated reflection spectra of 1DPC with period of N=40 in four arrangements in the range of 360 nm to 760 nm. (a) H(LH)⁴⁰; (b) (LH)⁴⁰; (c) (HL)⁴⁰; (d) L(HL)⁴⁰

Fig. 2. Calculated reflection spectra of 1DPC with period of N=5 in four arrangements in the range of 360 nm to 760 nm. (a) H(LH)⁵; (b) (LH)⁵; (c) (HL)⁵; (d) L(HL)⁵

Fig. 3. The corresponding color outputs mapped in the CIE 1931 for H(LH)⁵ 1DPC structure

Fig. 4. Schematic of ITO/BTO/ITO nanofilms based on a black layer

Fig. 5. FEM model. (a) FEM model of nanofilms based on a black layer; (b) FEM model of nanofilms based on a white layer

Fig. 6. Photos of the fabricated samples of ITO/BTO/ITO nanofilms with different thickness on white or black layers

Fig. 7. Simulated energy distribution of the sample with BTO nanofilms of 140 nm thick at the wavelength of 600.6 nm

Fig. 8. Results of reflected spectra. (a) Simulated and measured reflected spectra of the samples with a black layer; (b) simulated reflected spectra of the samples with a white layer

Fig. 9. Corresponding color outputs mapped in the CIE 1931 for the proposed novel nano-film structure based on a black layer

Fig. 10. Simulated reflection spectra of BTO thin films with different refractive indexes and 170 nm thick