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DY: Fachverband Dynamik und Statistische Physik

DY 30: Posters II

DY 30.50: Poster

Donnerstag, 25. März 2010, 16:00–18:00, Poster C

The mean free path of photons in granular media — •Sonia Utermann^1,2, Jonathan Kohler^2,3, and Matthias Schröter² — ¹Georg August Universität Göttingen — ²Max-Planck-Institut für Dynamik und Selbstorganisation — ³Vanderbilt University

Light transport is a powerful tool for probing the dynamics of dense, multiply scattering media. We use it to measure the kinetic granular temperature of a water-fluidised bed of glass spheres. This contribution shows our quest for the necessary light transport length scale: the photon mean free path, l^∗. We measure l^∗ using both transmission and incoherent backscattering and present our results as a function of (a) the packing density of the grains; (b) the size of the grains; (c) their refractive index; and (d) their surface roughness.