Dynamic multiple scattering: Ballistic photons and the breakdown of the photon-diffusion approximation

Isaac Freund, Moshe Kaveh, Michael Rosenbluh

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

We find experimentally that in the forward direction the length scale of quasiballistic photons dominates the dynamic intensity-intensity correlation function of light multiply scattered from randomly diffusing spheres. This implies a breakdown of the photon-diffusion approximation, which is characterized by a single length, the transport mean free path. We suggest why this breakdown occurs, introduce phenomenologically a dynamic correlation length as an additional length scale, and with this extension reconcile the theory with experiment.

Original languageEnglish
Pages (from-to)1130-1133
Number of pages4
JournalPhysical Review Letters
Volume60
Issue number12
DOIs
StatePublished - 1988

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