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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 13, Iss. 20 — Oct. 3, 2005
  • pp: 7954–7969

Time-resolved ring structure of circularly polarized beams backscattered from forward scattering media

Kevin G. Phillips, Min Xu, S.K. Gayen, and R.R. Alfano  »View Author Affiliations

Optics Express, Vol. 13, Issue 20, pp. 7954-7969 (2005)

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The backscattering of circularly polarized light at normal incidence to a half-space of scattering particles is studied using the Electric Field Monte Carlo (EMC) method. The spatial distribution of the backscat-tered light intensity is examined for both the time-resolved and continuous wave cases for large particles with anisotropy factor, g, in the range 0.8 to 0.97. For the time-resolved case, the backscattered light with the same helicity as that of the incident beam (co-polarized) is found to form a ring centered on the point of incidence. The ring expands and simultaneously grows weak as time increases. The intensity of backscattered light with helicity opposite to that of the incident beam (cross-polarized) is found to exhibit a ring behavior for g ≥ 0.85, with significant backscattering at the point of incidence. For the continuous-wave case no such ring pattern is observed in backscattered light for either helicity. The present EMC study suggests that the ring behavior can only be observed in the time domain, in contrast to previous studies of light backscattered from forward scattering media based on the scalar time-independent Fokker-Planck approximation to the radiative transfer equation. The time-dependent ring structure of backscattered light may have potential use in subsurface imaging applications.

© 2005 Optical Society of America

OCIS Codes
(030.5620) Coherence and statistical optics : Radiative transfer
(170.3660) Medical optics and biotechnology : Light propagation in tissues
(170.6920) Medical optics and biotechnology : Time-resolved imaging
(290.1350) Scattering : Backscattering
(290.4210) Scattering : Multiple scattering

ToC Category:
Research Papers

Original Manuscript: August 18, 2005
Revised Manuscript: September 19, 2005
Published: October 3, 2005

Kevin Phillips, Min Xu, S. Gayen, and R. Alfano, "Time-resolved ring structure of circularly polarized beams backscattered from forward scattering media," Opt. Express 13, 7954-7969 (2005)

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