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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 2, Iss. 9 — Sep. 26, 2007

Laser light scattering in turbid media Part I: Experimental and simulated results for the spatial intensity distribution

Edouard Berrocal, David L. Sedarsky, Megan E. Paciaroni, Igor V. Meglinski, and Mark A. Linne  »View Author Affiliations


Optics Express, Vol. 15, Issue 17, pp. 10649-10665 (2007)
http://dx.doi.org/10.1364/OE.15.010649


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Abstract

We investigate the scattering and multiple scattering of a typical laser beam (λ=800 nm) in the intermediate scattering regime. The turbid media used in this work are homogeneous solutions of monodisperse polystyrene spheres in distilled water. The two-dimensional distribution of light intensity is recorded experimentally, and calculated via Monte Carlo simulation for both forward and side scattering. The contribution of each scattering order to the total detected light intensity is quantified for a range of different scattering phase functions, optical depths, and detection acceptance angles. The Lorentz-Mie scattering phase function for individual particles is varied by using different sphere diameters (D=1 and 5 µm). The optical depth of the turbid medium is varied (OD=2, 5, and 10) by employing different concentrations of polystyrene spheres. Detection angles of θa =1.5° and 8.5° are considered. A novel approach which realistically models the experimental laser source is employed in this paper, and very good agreement between the experimental and simulated results is demonstrated. The data presented here can be of use to validate other modern Monte Carlo models, which generate high resolution light intensity distributions. Finally, an extrapolation of the Beer-Lambert law to multiple scattering is proposed based on the Monte Carlo calculation of the ballistic photon contribution to the total detected light intensity.

© 2007 Optical Society of America

OCIS Codes
(290.4020) Scattering : Mie theory
(290.4210) Scattering : Multiple scattering
(290.7050) Scattering : Turbid media

ToC Category:
Scattering

History
Original Manuscript: April 4, 2007
Revised Manuscript: July 19, 2007
Manuscript Accepted: July 20, 2007
Published: August 8, 2007

Virtual Issues
Vol. 2, Iss. 9 Virtual Journal for Biomedical Optics

Citation
Edouard Berrocal, David L. Sedarsky, Megan E. Paciaroni, Igor V. Meglinski, and Mark A. Linne, "Laser light scattering in turbid media Part I: Experimental and simulated results for the spatial intensity distribution," Opt. Express 15, 10649-10665 (2007)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=oe-15-17-10649


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