Abstract
We study the effect of strong single scattering on the ${C}_{0}$ correlation of intensity fluctuations in a disordered ensemble of discrete scatterers. Diagrammatic calculations of the ${C}_{0}$ contribution to the spatial correlation function are carried out for both scalar and electromagnetic waves beyond the standard Born approximation. For a system of Mie particles, the dependence of ${C}_{0}$ on the size and refractive index of the scatterers is examined. It is found that for highly refracting particles, the ${C}_{0}$ correlation acquires a pronounced resonant character. Close to the resonances, due to correlations between more than two wave fields, the magnitude of ${C}_{0}$ grows drastically, greatly exceeding the value for Born scatterers.
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