Diffusing-wave spectroscopy and multiple scattering of light in correlated random media

摘要: We discuss the diffusing-wave spectroscopy technique for multiple scattering of light as introduced in recent experiments. This has proven to be useful probing self-diffusion particles suspension by measuring light-intensity autocorrelation function. show how function depends upon dynamic structure factor medium presence correlations between particles. There is a simple generalization result obtained uncorrelated media include factor. Previous theoretical work employed white-noise model, valid small centers. The results this model are only so long propagation can regarded diffusive. On short length scales, however, becomes increasingly ballistic nature. present an exact formal solution transport equation capable describing crossover from diffusive propagation. resulting kernel provides correction diffusion approximation large particles, which substantially improves agreement with measured functions. also polarization dependence both well