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A point source in a disordered scattering medium generates a speckle patternwith non-universal features, giving rise to the so-called C_0 correlation. Weanalyze theoretically the relationship between the C_0 correlation and thestatistical fluctuations of the local density of states, based on simplearguments of energy conservation. This derivation leads to a clear physicalinterpretation of the C_0 correlation. Using exact numerical simulations, weshow that C_0 is essentially a correlation resulting from near-fieldinteractions. These interactions are responsible for the non-universality ofC_0, that confers to this correlation a huge potential for sensing and imagingat the subwavelength scale in complex media.

Near-field interactions and non-universality in speckle patterns produced by a point source in a disordered medium