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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Vol. 21, Iss. 8 — Aug. 30, 2004
  • pp: 1430–1437

Diffusive-to-ballistic transition in dynamic light transmission through thin scattering slabs: a radiative transfer approach

Rachid Elaloufi, Rémi Carminati, and Jean-Jacques Greffet  »View Author Affiliations

JOSA A, Vol. 21, Issue 8, pp. 1430-1437 (2004)

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We study the deviation from diffusion theory that occurs in the dynamic transport of light through thin scattering slabs. Solving numerically the time-dependent radiative transfer equation, we obtain the decay time and the effective diffusion coefficient Deff. We observe a nondiffusive behavior for systems whose thickness L is smaller than 8ltr, where ltr is the transport mean free path. We introduce a simple model that yields the position of the transition between the diffusive and the nondiffusive regimes. The size dependence of Deff in the nondiffusive region is strongly affected by internal reflections. We show that the reduction of ∼50% of Deff that was observed experimentally [Phys. Rev. Lett. 79, 4369 (1997)] can be reproduced by the radiative transfer approach. We demonstrate that the radiative transfer equation is an appropriate tool for studying dynamic light transport in thin scattering systems when coherent effects play no significant role.

© 2004 Optical Society of America

OCIS Codes
(170.3660) Medical optics and biotechnology : Light propagation in tissues
(170.5280) Medical optics and biotechnology : Photon migration
(290.1990) Scattering : Diffusion
(290.4210) Scattering : Multiple scattering
(290.7050) Scattering : Turbid media

Original Manuscript: October 17, 2003
Revised Manuscript: February 17, 2004
Manuscript Accepted: February 17, 2004
Published: August 1, 2004

Rachid Elaloufi, Rémi Carminati, and Jean-Jacques Greffet, "Diffusive-to-ballistic transition in dynamic light transmission through thin scattering slabs: a radiative transfer approach," J. Opt. Soc. Am. A 21, 1430-1437 (2004)

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