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Reflection spectra and photographs of the gel-immobilized colloidal photonic crystal films with an NIPAM mole fraction of x = 0.8 immersed in elastomer precursor solutions with PEPA concentrations of (A) 0 wt.%, (B) 20 wt.%, (C) 40 wt.%, (D) 60 wt.%, (E) 80 wt.%, and (F) 90 wt.% at each process ((a) before and (b) after the solvent replacement and (c) after UV light irradiation). The length of the scale bar in the photographs is 1 mm.
