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Proceedings Paper

Diffusing-wave spectroscopy beyond the diffusive regime: the influence of short light paths and anisotropic scattering
Author(s): R. Pierrat; N. Ben Braham; F. Scheffold; R. Carminati
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Paper Abstract

We study the fluctuations of light multiply scattered by particles under Brownian motion in a fluid. We focus on the behavior of the time correlation function of the field in the non-diffusive regime, in both transmission and reflection. In transmission through optically thin systems, an extended Diffusing-Wave Spectroscopy (DWS) model based on the Radiative Transfer Equation (RTE) is described, which predicts substantial deviations from the standard DWS theory. For backscattered light, experiments using unpolarized light show a clear dependence on the anisotropy factor g. This behavior is not described by the standard DWS theory. A good agreement with the data is obtained using the RTE model, and an approximate model in which the path-length distribution of the standard DWS is corrected by a prefactor which depends on the level of anisotropy. These results should have broad applications in diffuse-light biomedical imaging, and in the field of soft-materials and biomaterials analysis.

Paper Details

Date Published: 14 April 2006
PDF: 7 pages
Proc. SPIE 6191, Biophotonics and New Therapy Frontiers, 619116 (14 April 2006); doi: 10.1117/12.660912
Show Author Affiliations
R. Pierrat, Lab. EM2C, Ecole Centrale Paris, CNRS (France)
N. Ben Braham, Univ. of Fribourg (Switzerland)
F. Scheffold, Univ. of Fribourg (Switzerland)
R. Carminati, Lab. EM2C, Ecole Centrale Paris, CNRS (France)

Published in SPIE Proceedings Vol. 6191:
Biophotonics and New Therapy Frontiers
Romualda Grzymala; Olivier Haeberle, Editor(s)

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