Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2005-11-28
Appl. Opt. 45, 2199-2204 (2006)
Physics
Condensed Matter
Soft Condensed Matter
experiment, available at http://www.opticsinfobase.org/abstract.cfm?URI=ao-45-10-2199
Scientific paper
10.1364/AO.45.002199
All prior applications of Diffusing-Wave Spectroscopy (DWS) to aqueous foams rely upon the assumption that the electric field of the detected light is a Gaussian random variable and that, hence, the Siegert relation applies. Here we test this crucial assumption by simultaneous measurement of both second and third-order temporal intensity correlations. We find that the electric field is Gaussian for typical experimental geometries equivalent to illumination and detection with a plane wave, both for backscattering and transmission through an optically-thick slab. However, we find that the Gaussian character breaks down for point-in / point-out backscattering geometries in which the illumination spot size is not sufficiently large in comparison with the size of the intermittent rearrangement events.
Durian Douglas J.
Gittings A. S.
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