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Optimizing Light Storage in Scattering Media with the Dwell-Time Operator.

M Durand1, S M Popoff1, R Carminati1

  • 1ESPCI Paris, PSL University, CNRS, Institut Langevin, 1 rue Jussieu, F-75005 Paris, France.

Physical Review Letters
|January 11, 2020
PubMed
Summary
This summary is machine-generated.

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Wave front shaping optimizes light energy storage in disordered media. This method uses a dwell-time operator derived from the scattering matrix, enabling energy deposition in complex media without guide stars.

Area of Science:

  • Optics and Photonics
  • Complex Media Physics
  • Wave Phenomena

Background:

  • Disordered media present challenges for light energy control.
  • Wave front shaping offers potential for precise light manipulation.
  • Understanding light propagation in diffusive media is crucial for energy storage.

Purpose of the Study:

  • To demonstrate optimal control of light energy storage in disordered media using wave front shaping.
  • To develop and analyze a dwell-time operator based on the scattering matrix.
  • To investigate the energy deposition capabilities of this operator in complex media.

Main Methods:

  • Constructing a dwell-time operator from the scattering matrix.
  • Numerical and analytical characterization of the eigenvalue distribution in the diffusive regime (L >> ℓ).

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  • Investigating energy storage in resonant targets within complex media.

    • Main Results:

    • The dwell-time operator exhibits a finite support with maximal dwell times significantly exceeding the most likely values by a factor of (L/ℓ)².
    • Highest dwell-time eigenstates demonstrate superior energy deposition compared to open channels.
    • Successful demonstration of energy storage in buried resonant targets without guide stars.

    Conclusions:

    • Wave front shaping provides optimal control for light energy storage in disordered media.
    • The dwell-time operator is a powerful tool for enhancing energy deposition.
    • This technique offers a novel approach for targeting and energy storage in complex and biological tissues.