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Enhanced mesoscopic correlations in dynamic speckle patterns.

S E Skipetrov1

  • 1Laboratoire de Physique et Modélisation des Milieux Condensés/CNRS, Maison des Magistères, Université Joseph Fourier, 38042 Grenoble, France. SergeySkipetrov@grenoble.cnrs.fr

Physical Review Letters
|December 17, 2004
PubMed
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Speckle patterns in disordered waveguides evolve over time. Long-range correlations grow linearly, exceeding continuous-wave values, a phenomenon applicable to mesoscopic interference.

Area of Science:

  • Condensed matter physics
  • Wave propagation in disordered media

Background:

  • Speckle patterns arise from wave interference in complex media.
  • Understanding temporal dynamics is crucial for characterizing wave transport.

Purpose of the Study:

  • Investigate the temporal evolution of speckle patterns.
  • Analyze the correlation properties of speckles from short wave pulse transmission.
  • Explore the physical mechanisms behind observed temporal effects.

Main Methods:

  • Transmission of short wave pulses through a disordered waveguide.
  • Analysis of speckle pattern formation and correlation functions.
  • Comparison with continuous-wave (cw) illumination scenarios.

Main Results:

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  • Short-range speckle structure remains consistent with cw illumination.
  • Long-range correlations between speckle spots exhibit linear growth with time.
  • Observed correlations can surpass their cw counterparts.

Conclusions:

  • The temporal evolution of speckle patterns reveals distinct long-range correlation dynamics.
  • Linear growth of correlations is linked to wave propagation in the diffuse regime.
  • This phenomenon may extend to other mesoscopic interference effects.