Polariton modes in a cylindrical microcavity in the polariton lasing regime

The spectra of exciton-polariton photoluminescence from cylindrical microcavities under optical excitation below and above the polariton lasing threshold under conditions of strong exciton–photon coupling are studied. Under relatively weak optical excitation, modes of lateral quantization of polaritons and whispering gallery modes were detected. Spectral distribution of these modes and spatial dependence of their wave functions in the plane of the cavity were observed. With an increase in the excitation intensity and a transition to the polariton lasing mode, only one, the longest-wavelength lasing line remained in the spectrum. It is suggested that, under strong optical excitation, the spectrum contains not only exciton-polariton, but also trion-polariton radiation.