A few experimental configurations explored the resonant coupling of polarized waveguide modes to surface plasmon excitations . Smith et al. showed that plasmon waveguide totalinternal-reflection Raman spectroscopy could interrogate molecules on flat gold surfaces using both s-and p-polarization . Elsewhere, integrated optics evanescent wave SERS (IOEWSERS) has been used to explore enhanced Raman scattering from molecules attached to silver nanoparticles bound through a chemical spacer to a dielectric waveguide . In this case, the evanescent tail of a propagating TE wave elicited a SERS response that was used to examine proton-deprotonation and Cu 2+ coordination to 4-mercaptopyridine .