Scanning-probe Raman spectroscopy with single-molecule sensitivity

Catalin C. Neacsu, Jens Dreyer, Nicolas Behr, Markus B. Raschke

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

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-10nm length scale and a Raman enhancement up to ∼5×109. This combines vibrational spectroscopy with high resolution scanning-probe microscopy for ultrasensitive in situ analysis of individual molecules.
Original languageEnglish
Article number193406
Number of pages4
JournalPhysical review B
Publication statusPublished - 1 May 2006


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