A monochromatic point source, embedded in a three-dimensional disordered medium, is considered. The resulting intensity pattern exhibits a new type of long-range correlation. The range of these correlations is infinite and their magnitude, normalized to the average intensity, is of order $1/k_0\ell$, where $k_0$ and $\ell$ are the wave number and the mean free path, respectively.

• Received 12 July 1999

DOI:https://doi.org/10.1103/PhysRevLett.83.4733