Abstract
At low temperature and for excitation densities well below the exciton saturation density in CdTe microcavities, the photoluminescence (PL) intensity of the lower polariton mode strongly increases with a marked threshold behaviour. We present results of pump–probe experiments which show that the stimulation of the lower polariton PL actually occurs in the strong exciton–photon coupling regime. We present also a detailed study of this stimulation effect as a function of the number of quantum wells in the microcavity and as a function of the detuning δ = EC — EX between exciton energy EX and the cavity mode energy EC. We show that: (i) our results cannot be interpreted in terms of the localised exciton model; (ii) phonon relaxation and exciton–exciton collisions or polariton–exciton collisions are involved in the stimulation.
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