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Measurements of optical properties of high-density media

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Abstract

Measurements of optical properties (scattering coefficient μs, absorption coefficient μa, reduced scattering coefficient μs′, and asymmetry factor g) have been carried out up to a volume particle concentration of ρ = 0.227. The results for μs and μs′ 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 μa 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 μs on particle concentration.

© 2003 Optical Society of America

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