Effect of the surface-plasmon resonance on the emission properties of rhodamine 6G infiltrated in synthetic opals

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. (c) 2005 American Institute of Physics.