Dresden 2014 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 28: Extreme Events
DY 28.2: Talk
Thursday, April 3, 2014, 09:45–10:00, ZEU 146
Experimental Observation of a Fundamental Length Scale of Waves in Random Media — •Sonja Barkhofen5,1, Jakob Metzger2,3, Ragnar Fleischmann2, Ulrich Kuhl4,1, and Hans-Jürgen Stöckmann1 — 1Fachbereich Physik, Philipps-Universität Marburg, Renthof 5, 35032 Marburg, Germany — 2Max-Planck-Institute for Dynamics and Self-Organization, Am Faßberg 17, 37077 Göttingen, Germany — 3Institute for Nonlinear Dynamics, Department of Physics, University of Göttingen, 37077 Göttingen, Germany — 4LPMC, CNRS UMR 7336, Université de Nice Sophia-Antipolis, F-06108 Nice, France — 5Applied Physics, University of Paderborn, Warburger Straße 100, 33098 Paderborn, Germany
Waves propagating through a weakly scattering random medium show a pronounced branching of the flow accompanied by the formation of freak waves, i.e. extremely intense waves. Theory predicts that this strong fluctuation regime is accompanied by its own fundamental length scale of transport in random media, parametrically different from the mean free path or the localization length. We report the experimental observation of this scaling using microwave transport experiments in quasi-two dimensional resonators with randomly distributed weak scatterers. Remarkably, the scaling range extends much further than expected from random caustics statistics.