Polarization-resolved strong coupling of fine-structure split excitons and microcavities

We investigate the fine-structure split excitons strongly coupled to photons in a micropillar by using the polarization-resolved micro-photoluminescence. Different coupling strengths are probed for the two excitons coupled respectively to the two polarized fundamental cavity modes. The orientation of energy states for both upper and lower exciton-polaritons is found rotating with the coupling due to the misorientation of exciton dipoles with the cavity modes. The polarization properties of this coherently exciton-photon coupling will also be presented.