MORPHOLOGY DEPENDENT RESONANCES IN RAMAN-SPECTRA OF OPTICALLY LEVITATED MICROPARTICLES - DETERMINATION OF RADIUS AND EVAPORATION RATE OF SINGLE GLYCEROL WATER DROPLETS BY MEANS OF INTERNAL-MODE ASSIGNMENT

An experimental setup for studies of morphology dependent resonances ( MDRs) in Raman spectra of optically levitated microdroplets is describ ed. This instrumentation is used for the study of MDRs in the Raman sp ectra of glycerol/water (3:1) droplets. Furthermore we show bow the MD Rs observed in the Raman spectra and their change with time can be use d to determine the radius and the index of refraction of single optica lly levitated droplets with very high accuracy. We further show how th e results of this study can be used to calculate the efficiency factor of the radiation pressure and compare it with the experimental monito red laser power.