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. 2022 Nov 14;10(2):2204469. doi: 10.1002/advs.202204469

Figure 2.

Figure 2

Design of PVA Fabry–Pérot (F–P) etalon with Ag NPs and Al mirror. a) Estimated volume swelling of spin‐coated PVA films (black dots) and its comparison with the previously reported (red dots).[ 40 ] b) Measured effective refractive index n eff and extinction coefficient k eff using commercial ellipsometry. The Ag NP films are assumed to be a composite of spherical Ag NPs in air. c) The measured and modeled Fresnel parameters of the ellipsometry data. The model (dots) coincides closely with the measured data (lines), confirming the reliability of measured optical properties of Ag NPs. Ψ exp: Measured amplitude ratio; Ψ mod: Modeled amplitude ratio; Δ exp: Measured phase difference; Δ mod: Modeled phase difference. d‐i) Simulated reflectance spectra depending on the PVA thickness. Black dotted lines: guide of the order of resonance mode (m). Red, green, blue lines: thickness that relates to RGB colors. d‐ii,iii) Simulated electric field distribution at dip (ii) and peak (iii) of the green dotted line spectrum when d = 310 nm. e) Simulated colors plotted on the CIE 1931 chromaticity diagram for the various values of PVA thickness. The dashed line indicates the sRGB color gamut.