SERS Characterization of Self-Assembled Monolayers Embedded on Plasmonic Nano-structure

We discuss Raman spectroscopic analysis of self-assembled monolayers embedded in two different types of nano-structures capable of sustaining localized surface plasmon-surface plasmon polariton coupling via nanoscale gaps and curved surface features. Both structures cosnsist of metal-molecule-metal (M$^3$) junctions which can also allow charge transport through the molecular bridges. Our results indicate different electromagnetic and charge transport characteristics as a function of the top metal-molecule chemical interaction. We also report direct correlations between charge transport states, SERS response and inelastic vibrational scattering in selected M$^3$ molecular electronic device junctions.