2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/230885We study the emission properties of confined polariton states in shallow zero-dimensional traps under non-resonant excitation. We evidence several relaxation regimes. For slightly negative photon-exciton detuning, we observe a nonlinear increase of the emission intensity, characteristic of carrier-carrier scattering assisted relaxation under strong-coupling regime. This demonstrates the efficient relaxation towards a confined state of the system. For slightly positive detuning, we observe the transition from strong to weak coupling regime and then to single-mode lasing.Citations updated with respect to the journal version, and figures made clearer. 8 pages, 4 figuresMesoscale and Nanoscale Physicstext