Ultralong-range radiative excitation transfer between quantum dots in a planar microcavity

We study the system of two quantum dots lying on the central plane of a planar semiconductor microcavity. By solving the full Maxwell problem, we demonstrate that the rate of resonant excitation transfer between the two dots decays as d as a function of the distance d at long distance. This very long-range mechanism is due to the leaky and guided modes of the microcavity, which act as effective radiative transfer channels. At short distance, the d dependence of the Förster mechanism, induced by the electrostatic dipole-dipole interaction, is recovered.