Angular-resolved photoluminescence spectra have been obtained from polymer-made opaline photonic crystals impregnated with Coumarin dye. Spectral changes with optical excitation power and the direction of detection have been analyzed. The anisotropy in the suppression of the spontaneous emission is shown to be in accord with the Bragg stop-band dispersion.
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Romanov et al. (2002) studied this question.
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