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Fabrication and Characterization of Disordered Polymer Optical Fibers for Transverse Anderson Localization of Light
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Anderson localization in optical waveguide arrays with off-diagonal coupling disorder.

Lane Martin1, Giovanni Di Giuseppe, Armando Perez-Leija

  • 1CREOL, The College of Optics & Photonics, University of Central Florida, Orlando, FL 32816, USA.

Optics Express
|July 13, 2011
PubMed
Summary

Researchers observed Anderson localization in one-dimensional waveguide arrays by introducing off-diagonal disorder. Higher disorder levels strengthened the wave localization effect, demonstrating a key phenomenon in disordered systems.

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Area of Science:

  • Optics and Photonics
  • Condensed Matter Physics
  • Wave Phenomena

Background:

  • Wave propagation in periodic structures typically exhibits ballistic transport.
  • Disorder can significantly alter wave behavior, leading to phenomena like localization.
  • Waveguide arrays provide a controllable platform for studying wave dynamics.

Purpose of the Study:

  • To experimentally observe Anderson wave localization in a one-dimensional waveguide array.
  • To investigate the effect of off-diagonal disorder on wave transport.
  • To correlate the strength of disorder with the degree of wave localization.

Main Methods:

  • Fabrication of one-dimensional waveguide arrays in silica glass.
  • Precise control of coupling parameters via waveguide positioning to introduce off-diagonal disorder.
  • Observation of wave transport dynamics in both ordered and disordered arrays.

Main Results:

  • Ballistic transport was observed in the absence of disorder, consistent with discrete diffraction.
  • Anderson localization of waves was clearly observed upon introduction of off-diagonal disorder.
  • A direct correlation was found between the level of disorder and the strength of the localization signature.

Conclusions:

  • Off-diagonal disorder is a key factor in inducing Anderson localization in waveguide arrays.
  • Waveguide arrays offer a robust experimental system for studying wave localization phenomena.
  • The findings contribute to the understanding of wave transport in disordered media.