We investigate the spectrally narrowed emission (SNE) from rhodamine 6G infiltrated in synthetic opals enhanced by the surface-plasmon resonance effect of Ag particles anchored on the internal surface of the synthetic opals. At a larger number density of Ag particles, SNE is observed at a lower pump intensity, and the intensity is reduced to one-tenth without Ag. The enhancement factor is qualitatively reproduced by theoretical calculations as a function of the amount of Ag particles. These results indicate that the enhancement is caused by the surface-plasmon resonance.
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Ishikawa et al. (2005) studied this question.
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