Multispeckle diffusing-wave spectroscopy with a single-mode detection scheme

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P. Zakharov, F. Cardinaux, and F. Scheffold
Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland

Received 11 June 2005; revised 2 December 2005; published 30 January 2006

Wepresent a detection scheme for diffusing-wave spectroscopy (DWS) based ona two-cell geometry that allows efficient ensemble averaging. This isachieved by putting a fast rotating diffuser in the opticalpath between laser and sample. We show that the recorded(multispeckle) correlation echoes provide an ensemble averaged signal that doesnot require additional time averaging. Furthermore, combined with traditional two-cellDWS, the full intensity autocorrelation function can be measured witha single experimental setup. The scheme provides access to alarge range of correlation times thus opening an experimental windowfor the study of slowly relaxing and arrested systems, suchas viscoelastic complex fluids, colloidal glasses, and gels.

URL:	http://link.aps.org/doi/10.1103/PhysRevE.73.011413
DOI:	10.1103/PhysRevE.73.011413
PACS:	82.70.Dd; 42.30.Ms; 78.35.+c 82.70.Dd Colloids 42.30.Ms Speckle and moire patterns 78.35.+c Brillouin and Rayleigh scattering; other light scattering (condensed matter) YEAR: 2006
KEYWORDS:	colloids, diffusion, gels, non-Newtonian fluids

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