Enhanced Emission from Photoactivated Silver Clusters Coupled with Localized Surface Plasmon Resonance

We report the effect of local surface plasmon resonance (LSPR) of Ag nanoparticles on the emission properties of photoactivated Ag clusters. The prepared Ag nanoparticles showed strong surface enhanced Raman scattering (SERS) upon green laser excitation (514.5 nm), which indicates the appearance of an effective field enhancement. Along with the strong SERS, selective emission from the photoactivated Ag cluster was also observed only for the emissive Ag cluster that was resonant with the LSPR. The coupling with the LSPR also demonstrated the ability to observe the emission from only a single emissive site, even if several nonresonant emissive clusters are present in close proximity.