Abstract
The rotational correlation function of anisotropic colloidal particles can be measured by observing the fluctuations of the depolarized intensity scattered in the forward direction. We present a theoretical treatment of forward depolarized light scattering which compares homodyne and heterodyne detection of the dynamics of the depolarized field, and describes the statistical properties of the depolarized forward scattered field, showing that the relation connecting the intensity correlation function to the field correlation function is different from the standard Siegert relation. Our calculations indicate the importance of the insertion of a quarter-wave plate between the transmitted beam and the depolarized forward scattered field. In order to illustrate the theoretical calculations, we present experimental results concerning the measurement of the rotational diffusion coefficient in dispersions of fluorinated polymer colloids.
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