OBSERVATION OF FLUORESCENCE BACKGROUND SUPPRESSION IN RAMAN-SCATTERING ON SINGLE MICROPARTICLES

Raman scattering experiments were performed on single optically levita ted microparticles. In comparison with bulk experiments an dramatic en hancement of the Raman scattering relative to the fluorescence scatter ing was observed. Two real-world samples, a monomer for use in laser s tereolithography and an engine lubricant, were investigated. Furthermo re Dioctylphthalat (DOP), doped with fluorescent dye Coumarin 6, was s tudied by Raman spectroscopy in a droplet chain, on an optically levit ated particle and in a cuvette. The combination of Raman spectroscopy and optical levitation could be a new offspring for analytical applica tions of Raman spectroscopy. Liquid and solid microparticles with a fe w nanograms in mass can be investigated by this technique with excelle nt signal-to-noise ratio.