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Photon localization in resonant media.

A A Chabanov1, A Z Genack

  • 1Physics Department, Queens College of CUNY, Flushing, New York 11367, USA.

Physical Review Letters
|October 3, 2001
PubMed
Summary
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Localization of microwaves was observed in a waveguide containing alumina spheres. This phenomenon, occurring near the first Mie resonance, affects photon density and transit time, leading to a minimum in the Thouless number.

Area of Science:

  • Physics
  • Electromagnetism
  • Materials Science

Background:

  • Microwave transmission through dielectric spheres exhibits complex behavior near Mie resonances.
  • Understanding wave localization is crucial for designing advanced optical and electronic devices.

Purpose of the Study:

  • To investigate microwave transmission and wave localization in a waveguide with randomly positioned alumina spheres.
  • To analyze the behavior of photon transit time and density of states near Mie resonances.

Main Methods:

  • Measurements of microwave transmission were performed over the first five Mie resonances.
  • Transmission fluctuations were analyzed to identify the occurrence of localization.
  • Photon transit time and photon density of states were measured near resonances.

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Main Results:

  • Precipitous drops in transmission and sharp peaks in photon transit time were observed near all resonances.
  • Wave localization was found to occur only in a narrow frequency window above the first Mie resonance.
  • A more pronounced drop in photon density of states compared to photon transit time was noted above the first resonance, resulting in a minimum Thouless number.

Conclusions:

  • Microwave localization in this system is a resonance-specific phenomenon, primarily occurring above the first Mie resonance.
  • The interplay between photon density of states and photon transit time dictates the localization behavior and Thouless number.
  • These findings provide insights into wave propagation and localization in disordered dielectric structures.