Tuning and fixing of uniform Bragg reflection color of gel-immobilized colloidal photonic crystal films

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Fig. 1 Schematic diagram of the mechanical compression apparatus used for tuning the Bragg

wavelength of the gel-immobilized colloidal crystal film. (A) Side view and (B) top view (a:

micrometer, b: quartz substrate, c: gel film, d: spring).

Fig. 2 (A) Photographs and (B) reflection spectra for the gel-immobilized colloidal crystal film at

various distances between the substrates. (C) Plot of the Bragg wavelength as a function of the

distance between the substrates. The solid line is a calculated curve. The inset represents the

enlarged graph.

Fig. 3 Reflection spectra and photographs of the solvent-free polymer films containing colloidal

crystals prepared at different distances between substrates of (A) 70 µm, (B) 82 µm, and (C) 92 µm.

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