SummaryFor laser spectroscopy at variable temperatures with high spatial resolution a combined scanning near-field optical and confocal microscope was developed. Rhodamine 6G (R6G) dye molecules dispersed on silver nano-particles or nano-clusters were investigated. For optical excitation of the molecules, either an aperture probe or a focused laser spot in confocal arrangement were employed. Raman spectra in the wavenumber range between 300 cm − 1 and 3000 cm − 1 at room temperatures down to 8.5 K were recorded. Many of the observed Raman lines can be associated with the structure of the adsorbed molecule. Intensity fluctuations in spectral sequences were observed down to 77 K and are indicative of single molecule sensitivity.

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