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Applied Optics

Applied Optics


  • Vol. 42, Iss. 19 — Jul. 1, 2003
  • pp: 4023–4030

Measurements of optical properties of high-density media

Giovanni Zaccanti, Samuele Del Bianco, and Fabrizio Martelli  »View Author Affiliations

Applied Optics, Vol. 42, Issue 19, pp. 4023-4030 (2003)

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Measurements of optical properties (scattering coefficient μ s , absorption coefficient μ a , reduced scattering coefficient μ s ′, and asymmetry factor g) have been carried out up to a volume particle concentration of ρ = 0.227. The results for μ s and μ s ′ show significant deviations from the linear dependence on ρ as expected when the independent scattering assumption is fulfilled. The asymmetry factor also changed significantly. In contrast, the dependence of μ a remained linear even at the largest concentration investigated. The simple linear dependence of absorption on the chromophore concentration expected from the independent scattering assumption is thus applicable also to spectroscopic measurements of dense media. A comparison with an approximate theoretical model based on the Foldy-Twersky equation is also reported. The model provides a good description of the dependence of μ s on particle concentration.

© 2003 Optical Society of America

OCIS Codes
(160.4760) Materials : Optical properties
(170.6510) Medical optics and biotechnology : Spectroscopy, tissue diagnostics
(170.7050) Medical optics and biotechnology : Turbid media
(290.0290) Scattering : Scattering
(290.1990) Scattering : Diffusion

Original Manuscript: October 11, 2002
Revised Manuscript: April 16, 2003
Published: July 1, 2003

Giovanni Zaccanti, Samuele Del Bianco, and Fabrizio Martelli, "Measurements of optical properties of high-density media," Appl. Opt. 42, 4023-4030 (2003)

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