Abstract
We present some experimental study of CdTe II–VI microcavity polaritons generated bystrong non-resonant optical excitation. We first compare spectra of luminescence underhigh excitation and white light reflectivity showing that the polariton stimulation occurs inthe strong coupling regime. In a second part we present a measurement of the integratedpolariton emission intensity versus the excitation power: the stimulated emission exhibitsan exponential behaviour which excludes a polariton/polariton quadratic collision process.In a third part we present an angle-resolved experiment showing that the stimulationpeak is dispersion free while the residual spontaneous emission keeps its usualdispersion curve; we exclude a simple scattering phenomenon due to surface roughnessand discuss the possibility of real space shrinkage or polariton collisions within acoherent population inspired by the theoretical work of Ciuti and co-workers.
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