Abstract
Excitation of synthetic opal with 337.1-nm nitrogen laser pulses gives rise to a persistent afterglow, lasting 15 s at 10 K. The afterglow spectrum correlates with the emission spectrum of opal observed earlier under excitation with UV light-emitting diodes. The effect can be understood in terms of the peaks in the density of photon states near the edges of the photonic band gap in photonic crystals.
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