Abstract
A point source in a disordered scattering medium generates a speckle pattern with nonuniversal features, giving rise to the so-called correlation. We analyze theoretically the relationship between the 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 correlation. Using exact numerical simulations, we show that is essentially a correlation resulting from near-field interactions. These interactions are responsible for the nonuniversality of that confers to this correlation a huge potential for sensing and imaging at the subwavelength scale in complex media.
- Received 23 July 2010
DOI:https://doi.org/10.1103/PhysRevA.82.043823
©2010 American Physical Society