Extended quasimodes within nominally localized random waveguides

Details Extended quasimodes within nominally localized random waveguides Extended quasimodes within nominally localized random waveguides

2006-02-16

arxiv.org/abs/cond-mat/0602393v2

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, submitted to PRL (23 December 2005)

Scientific paper

10.1103/PhysRevLett.96.183902

We have measured the spatial and spectral dependence of the microwave field inside an open absorbing waveguide filled with randomly juxtaposed dielectric slabs in the spectral region in which the average level spacing exceeds the typical level width. Whenever lines overlap in the spectrum, the field exhibits multiple peaks within the sample. Only then is substantial energy found beyond the first half of the sample. When the spectrum throughout the sample is decomposed into a sum of Lorentzian lines plus a broad background, their central frequencies and widths are found to be essentially independent of position. Thus, this decomposition provides the electromagnetic quasimodes underlying the extended field in nominally localized samples. When the quasimodes overlap spectrally, they exhibit multiple peaks in space.

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