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Speckle fluctuations resolve the interdistance between incoherent point sources in complex media

  • Carminati, R. ESPCI ParisTech, PSL Research University, CNRS, Institut Langevin, Paris, France
  • Cwilich, G. Department of Physics, Yeshiva University, New York, USA
  • Froufe-Pérez, Luis S. Department of Physics, University of Fribourg, Switzerland
  • Sáenz, J. J. Departamento de Física de la Materia Condensada, Instituto Nicolás Cabrera and Condensed Matter Physics Center, Universidad Autónoma de Madrid, Spain - Donostia International Physics Center, San Sebastián, Spain
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  • Physical Review A. - 2015, vol. 91, no. 2, p. 023807
English We study the fluctuations of the light emitted by two identical incoherent point sources in a disordered environment. The intensity-intensity correlation function and the speckle contrast, obtained after proper temporal and configurational averaging, encode the relative distance between the two sources. This suggests the intriguing possibility that intensity measurements at only one point in a speckle pattern produced by two incoherent sources can provide information about the relative distance between the sources, with a precision that is not limited by diffraction. The theory also suggests an alternative approach to the Green's-function retrieval technique, where the correlations of the isotropic ambient noise detected by two receivers are replaced by a measurement at a single point of the noise due to two fluctuating incoherent sources.
Faculté des sciences et de médecine
Département de Physique
  • English
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