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Physical Review B
Single-molecule vibrational Raman spectroscopy of malachite green adsorbed on planar metal surfaces is achieved by means of optical local-field enhancement provided by a scanning nanoscopic metallic tip. The single-molecule signature is evident from spectral diffusion and a discretization of Raman peak intensities. The optical tip-sample coupling gives rise to a localization of the response down to a sub-10 nm length scale and a Raman enhancement up to ϳ5 ϫ 10 9 . This combines vibrationaldoi:10.1103/physrevb.73.193406 fatcat:bm7xrfjvm5fznpwshygcf4w4ka