Answers are grounded in this paper and cite their sources.
I see the light: When an electroactive inverse polymer-gel opal is electrochemically oxidized and reduced, the lattice swells and shrinks, respectively. Concomitantly the wavelength of brightly diffracted light can be altered all the way from the ultraviolet through the visible to the near infrared (see picture).
No takes yet. Share an insight, caveat, or question.
Puzzo et al. (2008) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: