Spin Hall effect in DCA-based organic microcavities at room temperatre

Organic semiconductors have emerged as promising platforms for room-temperature exciton–polariton physics. However, the optical spin Hall effect (OSHE) has yet to be observed in real space within 9,10-dicyanoanthracene (DCA) organic crystals. Here, we report the OSHE in a DCA organic microcavity. The inherent crystalline anisotropy of DCA induces splitting Rashba–Dresselhaus-type photonic spin–orbit coupling in a Fabry–Pérot cavity. Angle-resolved photoluminescence spectroscopy reveals a characteristic spin-dependent polarization texture in momentum space. Moreover, near-field optical tomography directly visualizes the transverse spatial separation of oppositely circularly polarized polariton components. These results constitute the first real-space observation of the OSHE in a DCA organic microcavity, highlighting its potential as a platform for room-temperature spin-polaritonic devices.