Polarization properties of strongly coupled exchange-split excitons and pillar microcavities

We demonstrate a combined experimental and theoretical investigation of the polarization properties of the strong coupling between fine structure-split excitons and anisotropy-split cavity modes. While the temperature is varied to control the light-matter coupling, we observe a notable change in the emission polarization for the branch of the exciton-like polariton. The exciton dephasing is introduced in order to explain the temperature-sensitive effect on the emission polarization. We apply the medium-dependent Green function approach involving the polarization-dependent exciton dephasing to model the emission spectra, which shows qualitative agreement with our experimental results.