Modeling of multiple-scattering suppression by a one-beam cross-correlation system

I detail the results of adapting a rigorous algorithm, derived for multiple-scattering simulations in photon correlation spectroscopy, for modeling multiple-scattering suppression by a cross-correlation system that employs one laser beam and two slightly tilted detectors. The practical significance of the proposed numerical technique is shown for optimization of an arbitrary design configuration of cross correlation and for prediction of the ideal performance that is possible with that design. It is shown that the behavior of the coherent factor modeled versus the angle between detectors is in agreement with experimental data and analytical investigation. This factor permits mapping of the spatial extent of the single-scattering and the multiple-scattering speckles. The map holds important information about the optimal displacement of detectors for a given measurement setup, and it permits a comprehensive investigation of suppression of the scattering components, even when their magnitudes are small.