Contribution of Subradiant Plasmon Resonance to Electromagnetic Enhancement in Resonant Raman with Fluorescence Examined by Single Silver Nanoparticle Dimers

We investigate the spectral relationships between electromagnetic (EM) enhancement and surface-enhanced resonant Raman scattering (SERRS) with fluorescence (SEF), which is observed as background emission of SERRS, in context light–matter interactions subradiant plasmons molecular excitons, using single silver nanoparticle dimers a model system. focus on lowest-energy (superradiant) plasmon far-field to examine EM enhancement. classify into two types: those envelopes SERRS SEF have shapes similar resonance exhibit higher energy shifts than resonance. By examining these results, we aim determine degree morphological asymmetry based an mechanism. Our analysis types reveals that dipole–dipole dipole–quadrupole-coupled (subradiant resonance) are responsible for