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The control and active manipulation of spin-orbit coupling (SOC) in photonicsystems is fundamental in the development of modern spin optics and topologicalphotonic devices. Here, we demonstrate the control of an artificialRashba-Dresselhaus (RD) SOC mediated by photochemical reactions in amicrocavity filled with an organic single-crystal of photochromic phase-changecharacter. Splitting of the circular polarization components of the opticalmodes induced by photonic RD SOC is observed experimentally in momentum space.By applying an ultraviolet light beam, we control the spatial molecularorientation through a photochemical reaction and with that we control theenergies of the photonic modes. This way we realize a reversible conversion ofspin-splitting of the optical modes with different energies, leading to anoptically controlled switching between circularly and linearly polarizedemission from our device. Our strategy of in situ and reversible engineering ofSOC induced by a light field provides a promising approach to actively designand manipulate synthetic gauge fields towards future on-chip integration inphotonics and topological photonic devices.

Photochemical reaction enabling the engineering of photonic spin-orbit coupling in organic-crystal optical microcavities