Abstract
In this experimental and theoretical study of the radiation pressure on a microsphere and the radiant heating of that object due to illumination by a polarized laser beam it is shown that the radiation pressure can be measured directly by means of particle levitation in an electrodynamic balance. It is also demonstrated that the complex refractive index of an absorbing microsphere can be determined by comparison of the radiation pressure with theoretical calculations of the absorption and scattering cross sections. In addition, the complex refractive index of a weakly absorbing microdroplet is obtained by comparing measured evaporation rates with theoretical predictions based on computations of the internal heat source and solution of the governing energy equation. It is estimated that an imaginary component of the complex refractive index as small at 10 −8 can be determined in this way.
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