Surface-Enhanced Raman Spectroscopy of Dye and Thiol Molecules Adsorbed on Triangular Silver Nanostructures: A Study of Near-Field Enhancement, Localization of Hot-Spots, and Passivation of Adsorbed Carbonaceous Species
Figure 2
in the symmetry plane of nanoparticles (left column) and extinction, scattering, absorption cross-section and near-field enhancements spectra (right column). (a) and (b) Two Ag spheres of 60 nm and 50 nm diameter, separated by a gap of 5 nm. The near-field at the gap middle point () marked with × was calculated for a gap of 2 nm. (c) and (d) triangular particle (thickness 50 nm) and small sphere of 20 nm diameter. Gap between the particles is 2 nm. The insert shows half of both particles. (e) and (f) triangular particle and three small spheres of 20 nm diameter (only half geometry is presented in (e)). Gap between triangular particle and each sphere is 2 nm. In all configurations, the refractive index of medium is .
