OBSERVATION OF SUDDEN TEMPERATURE JUMPS IN OPTICALLY LEVITATED MICRODROPLETS DUE TO MORPHOLOGY-DEPENDENT INPUT RESONANCES

During the slow evaporation of an optically levitated microdroplet of a glycerol-water mixture (3:1) (approximately 12.44 mu m in radius) se veral morphology-dependent input resonances have been observed in its Raman spectrum. These resonances yield sudden temperature jumps of app roximately 10 degrees C in the microdroplet as evidenced by sudden shi fts in the output (Raman) resonance spectra. The latter effects could be explained by a simple energy balance calculation and the dependence of droplet refractive index and density on temperature.