Figure 2. Temperature tuning of Bragg diffraction from a 125-m-thick polymerized CCA film of 99-nm polystyrene spheres embedded in a poly(N-isopropylacrylamide) gel.

The shift of the diffraction wavelength results from the temperature-induced volume change of the gel, which alters the lattice spacing. Spectra were recorded in a UV-vis/near-IR spectrophotometer with the sample placed normal to the incident light beam. The inset shows the temperature dependence of the diffracted wavelength for the polymerized CCA film when the incident light is normal to the (110) plane of the lattice. (Adapted with permission from Ref. 22.)

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