Structural anisotropy induces topological polaritons that have recently captivated current research exploring novel phenomena governed by non-Hermitian light-matter interaction, tunable by polarization of light. In this work we show polarization in Raman scattering, which is normally determined by the symmetry of vibrational modes, can be continuously controlled inside an optical microcavity. The evolution of polarization states emerging from the dynamics of a parity-time (PT)-symmetric system consists of two polarized Stokes modes in resonance with the polariton bands. The magnitude and sign of the ellipticity of polarization ellipse manifest three phases of a PT-symmetric system leading to the effect of handedness switching in Raman polarization as the external parameter is tuned across the exceptional point. Our work provides a distinct mechanism for the transformation of polarization states in anisotropic media under a strong coupling regime, enabling a different route for polarization control and laying the foundation for next-generation optical technologies.

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• Cavity quantum electrodynamics
• Exciton polariton
• PT-symmetric quantum mechanics
• Polarization of light
• Quantum description of light-matter interaction
• Semiconductor microcavities
• Stimulated Raman scattering
• 2-dimensional systems
• Layered semiconductors
• Non-Hermitian systems
• Optical microcavities
• Lindblad equation
• Raman spectroscopy