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Researchers directly measured light speckle inside disordered materials using embedded DNA. This revealed unexpected properties of bulk speckle, challenging current theoretical models and opening new avenues for optical research.

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Area of Science:

  • Optics and Photonics
  • Condensed Matter Physics
  • Biophysics

Background:

  • Speckle patterns are fundamental interference effects of light in disordered media.
  • Direct measurement of bulk speckle inside random media is challenging due to physical access limitations.
  • Existing theoretical descriptions of bulk speckle face significant challenges.

Purpose of the Study:

  • To report the first direct measurements of spatially resolved intensity correlations of light inside a disordered medium.
  • To investigate fundamental properties of bulk speckles, such as size and polarization.
  • To compare experimental findings with theoretical predictions and numerical calculations.

Main Methods:

  • Utilized embedded DNA strings decorated with emitters separated by a controlled nanometric distance.
  • Developed a novel method for in situ measurement of light speckle within a disordered medium.
  • Performed rigorous numerical calculations to support experimental observations.

Main Results:

  • Successfully achieved direct, in situ measurements of bulk speckle properties.
  • Observed significant deviations in speckle size and polarization degrees of freedom from theoretical predictions.
  • Identified correlations among polarization components and nanoscale near-field contributions as key factors for deviations.

Conclusions:

  • The study provides the first direct experimental access to bulk speckle properties within disordered media.
  • Experimental results challenge existing theoretical models, highlighting the need for refined descriptions.
  • The findings offer new insights into light-matter interactions at the nanoscale in random environments.