Breakdown of diffusion in dynamics of extended waves in mesoscopic media.
We report the observation of nonexponential decay of pulsed microwave transmission through quasi-one-dimensional random dielectric media signaling the breakdown of the diffusion model. The decay rate of transmission falls nearly linearly in time corresponding to a nearly Gaussian distribution of the coupling strengths of quasinormal electromagnetic modes to free space at the sample surfaces. The peak and width of this distribution scale as L(-2.05) and L(-1.81), respectively.
Chabanov
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Department of Physics, Queens College of the City University of New York, Flushing, New York 11367, USA.
Zhang
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ZQ
Genack
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AZ