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. 2022 Mar 11;8(10):eabm8598. doi: 10.1126/sciadv.abm8598

Fig. 2. Optical responses of MNHM etalon.

Fig. 2.

(A) Reflection spectra of MNHM-SCN etalon at RH ranged from 0 to 90%. Dotted line, spectra retrieved from S parameters; dashed line, spectra calculated by FDTD method; solid line, measured spectra. Insets represent calculated and measured color swatches at the same range of RH. a.u., arbitrary units. (B) CIE 1931 color space of the XY values converted from the reflection spectra. (C) The change of thickness of the chitosan layer according to RH that is measured and calculated by AFM and FDTD. (D) SEM and modeled images of AgNPs-SCN slab. The color bar in the modeled one indicates depth information z at each pixel. (E) Effective refractive indices retrieved from S-parameter analysis. Black, real; red, imaginary. The dashed triangle shows the sRGB space. Triangle, S parameters; square, FDTD; circle, measurement. (F) Normalized electric field distribution of MNHM-SCN etalon (i) at the peak of the reflectance, 532 nm, and (ii) at the dip of the reflectance, 676 nm, both under RH 90%.