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Extended quasimodes within nominally localized random waveguides.

P Sebbah1, B Hu, J M Klosner

  • 1Department of Physics, Queens College of the City University of New York, Flushing, New York 11367, USA. sebbah@unice.fr

Physical Review Letters
|May 23, 2006
PubMed
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In disordered waveguides, overlapping spectral lines cause microwave fields to form multiple peaks, allowing energy to propagate further into the sample. This reveals underlying electromagnetic quasimodes in nominally localized systems.

Area of Science:

  • Physics
  • Electromagnetism
  • Wave Phenomena

Background:

  • Disordered systems can exhibit unique wave propagation characteristics.
  • Understanding wave localization and transmission in complex media is crucial for various applications.

Purpose of the Study:

  • To investigate the spatial and spectral dependence of microwave fields in open absorbing waveguides with random dielectric slabs.
  • To identify the underlying electromagnetic modes responsible for wave propagation in such disordered systems.

Main Methods:

  • Measurement of microwave field distribution (spatial and spectral) within an open absorbing waveguide.
  • Analysis of the spectral region where average level spacing exceeds typical level width.
  • Decomposition of the sample's spectrum into Lorentzian lines and a broad background.

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Main Results:

  • Multiple field peaks emerge within the sample when spectral lines overlap.
  • Substantial energy transmission beyond the first half of the sample occurs only when spectral lines overlap.
  • Central frequencies and widths of spectral components are position-independent.

Conclusions:

  • The decomposition method reveals electromagnetic quasimodes governing extended fields in nominally localized samples.
  • Overlapping spectral lines lead to spatially multi-peaked quasimodes, enhancing wave propagation in disordered waveguides.