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Spin-orbit coupling (SOC) of light plays a fundamental photophysics that isimportant for various fields such as materials science, optics, and quantumtechnology, contributing to the elucidation of new physical phenomena and thedevelopment of innovative applications. In this study, we investigate theimpact of SOC in a microcavity system using the highly oriented molecularcrystal. The unique molecular alignment of our crystal creates substantialoptical anisotropy, enabling the observation of significant SOC effects withina microcavity form. Through angle-resolved photoluminescence measurements andtheoretical calculations, the presence of Rashba-Dresselhaus (RD) SOC in thelower branch of polariton modes is revealed. We have observed for the firsttime polarization-coupled emission from polariton modes due to the RD-SOCeffect in a microcavity with a medium having both strong light-matter couplingand strong optical anisotropy. Theoretical investigations further elucidate theintricate interplay between the RD-SOC effect and anisotropic light-mattercoupling, leading to the emergence of both circularly and diagonally polarizedmode splittings. This study not only advances our understanding of optical SOCin microcavities but also highlights the potential of highly oriented molecularcrystals in manipulating SOC effects without external electric or magneticfields. These findings offer greatly promising platforms for developingtopological photonics and quantum technologies.

Rashba-Dresselhaus spin-orbit coupling and polarization-coupled luminescence in an organic single crystal microcavity