Extended Quasimodes within Nominally Localized Random Waveguides

P. Sebbah, B. Hu, J. M. Klosner, and A. Z. Genack
Phys. Rev. Lett. 96, 183902 – Published 10 May 2006

Abstract

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. These quasimodes may exhibit multiple peaks in space when they overlap spectrally.

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  • Received 23 December 2005

DOI:https://doi.org/10.1103/PhysRevLett.96.183902

©2006 American Physical Society

Authors & Affiliations

P. Sebbah1,2,*, B. Hu1, J. M. Klosner1, and A. Z. Genack1

  • 1Department of Physics, Queens College of the City University of New York, Flushing, New York 11367, USA
  • 2Laboratoire de Physique de la Matière Condensée, CNRS UMR6622 and Université de Nice - Sophia Antipolis, Parc Valrose, 06108, Nice Cedex 02, France

  • *Corresponding author. Email address: sebbah@unice.fr

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Vol. 96, Iss. 18 — 12 May 2006

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