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Keywords:

  • photonic crystals;
  • colloids;
  • opals;
  • defect structures
Thumbnail image of graphical abstract

A colloidal crystal with fundamental photonic stopband in the near-infrared and higher-frequency photonic bands in the visible was designed to yield impressive sensitivity to stacking fault formation, as reported by Geoff Ozin and co-workers on p. 1110. Diagnostic patterns of brilliant colors emerge, providing a powerful spectroscopic tool to elucidate the origin, nature, and control of stacking faults.