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Live Cell Imaging of F-actin Dynamics via Fluorescent Speckle Microscopy (FSM)
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Speckle instability: coherent effects in nonlinear disordered media.

Benoît Grémaud1, Thomas Wellens

  • 1Laboratoire Kastler Brossel, UPMC-Paris 6, ENS, CNRS; 4 Place Jussieu, F-75005 Paris, France.

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Dynamical instability leads to chaotic behavior in nonlinear scatterer speckle patterns. A discovered scaling law highlights the importance of interference effects, even in chaotic systems.

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Area of Science:

  • Physics
  • Nonlinear dynamics
  • Wave phenomena

Background:

  • Speckle patterns arise from wave interference.
  • Nonlinear scatterers introduce complex dynamics.
  • Understanding wave behavior in disordered systems is crucial.

Purpose of the Study:

  • To numerically investigate speckle patterns from nonlinear point scatterers.
  • To analyze the transition from weak localization to chaotic behavior.
  • To identify scaling laws governing instability and system properties.

Main Methods:

  • Numerical simulations of speckle pattern formation.
  • Analysis of statistical properties of instability thresholds.
  • Investigation of system size and disorder strength effects.

Main Results:

  • Dynamical instability observed in the weak localization regime.
  • Transition to chaotic behavior identified.
  • A scaling law discovered for instability thresholds and decay rates.
  • Coherent backscattering persists even in the chaotic regime.

Conclusions:

  • Interference effects are critically important in these systems.
  • The identified scaling law provides insights into system dynamics.
  • Nonlinear scatterers can lead to complex, chaotic wave behavior.