a) Dashed line : Dispersion relation of uncoupled photons and excitons in a GaAs microcavity. Solid line : Dispersion relation of microcavity polaritons in the strong-coupling regime in a typical GaAs-based cavity. b) Dispersion relation of polaritons in a model GaN-based microcavity. The arrows sketch exciton relaxation paths trough their interaction with acoustic phonon and their blocking in the bottleneck region. c) Scheme of the experiment performed in [5]. A short pumping laser pulse creates a polariton population at the inflexion point of the lower polariton branch dispersion. A probe pulse illuminates the cavity under normal incidence within a short delay with respect to the pump. It seeds the ground polariton state, stimulating the resonant polariton-polariton scattering.
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