Diffusing-wave spectroscopy of nonergodic media

Details Diffusing-wave spectroscopy of nonergodic media Diffusing-wave spectroscopy of nonergodic media

2001-03-05

arxiv.org/abs/cond-mat/0103097v1

Phys. Rev. E 63, 061404 (2001)

Physics

Condensed Matter

Soft Condensed Matter

RevTeX, 12 pages, 6 figures. Accepted for publication in Phys. Rev. E

Scientific paper

10.1103/PhysRevE.63.061404

We introduce an elegant method which allows the application of diffusing-wave spectroscopy (DWS) to nonergodic, solid-like samples. The method is based on the idea that light transmitted through a sandwich of two turbid cells can be considered ergodic even though only the second cell is ergodic. If absorption and/or leakage of light take place at the interface between the cells, we establish a so-called "multiplication rule", which relates the intensity autocorrelation function of light transmitted through the double-cell sandwich to the autocorrelation functions of individual cells by a simple multiplication. To test the proposed method, we perform a series of DWS experiments using colloidal gels as model nonergodic media. Our experimental data are consistent with the theoretical predictions, allowing quantitative characterization of nonergodic media and demonstrating the validity of the proposed technique.

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