Photonic bandgap (PGB) structures based on synthetic opal have been modified by in-situ growth of CdS. The resulting structures show an enhanced stop-band as determined from transmission and reflection measurements. Photoluminescence from the structures is squeezed to the low-energy side of the stop-band, with the effect increasing with higher fraction of CdS.
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Romanov et al. (1997) studied this question.
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