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A transition between the strong (coherent) and weak (incoherent) couplinglimits of resonant interaction between quantum well (QW) excitons and bulkphotons is analyzed and quantified as a function of the incoherent damping ratecaused by exciton-phonon and exciton-exciton scattering. For confined QWpolaritons, a second, anomalous, damping-induced dispersion branch arises anddevelops with increasing damping. In this case, the strong-weak couplingtransition is attributed to a critical damping rate, when the intersection ofthe normal and damping-induced dispersion branches occurs. For the radiativestates of QW excitons, i.e., for radiative QW polaritons, the transition isdescribed as a qualitative change of the photoluminescence spectrum at grazingangles along the QW structure. Furthermore, we show that the radiativecorrections to the QW exciton states with in-plane wavevector approaching thephoton cone are universally scaled by an energy parameter rather than diverge.The strong-weak coupling transition rates are also proportional to the sameenergy parameter. The numerical evaluations are given for a GaAs single quantumwell with realistic parameters.

Strong and weak coupling limits in optics of quantum well excitons