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

Abstract

A point source in a disordered scattering medium generates a speckle pattern with non-universal features, giving rise to the so-called C_0 correlation. We analyze theoretically the relationship between the C_0 correlation and the statistical fluctuations of the local density of states, based on simple arguments of energy conservation. This derivation leads to a clear physical interpretation of the C_0 correlation. Using exact numerical simulations, we show that C_0 is essentially a correlation resulting from near-field interactions. These interactions are responsible for the non-universality of C_0, that confers to this correlation a huge potential for sensing and imaging at the subwavelength scale in complex media.

References in corpus (3)

• Observation of Spatial Fluctuations of the Local Density of States in Random Media
• Fluctuations of local density of states and C0 speckle correlations are equal
• On the density of states and extinction mean free path of waves in random media: Dispersion relations and sum rules

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