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

Abstract

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 Green 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.

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• Fluctuations of the Electromagnetic Local Density of States as a Probe for Structural Phase Switching
• Spatial coherence of light inside three dimensional media
• Purcell effect with extended sources: The role of the cross density of states
• Quantum coherence of light emitted by two single-photon sources in a structured environment
• Spatial correlations of the spontaneous decay rate as a probe of dense and correlated disordered materials