All-Optical Linear-Polarization Engineering in Single and Coupled Exciton-Polariton Condensates

We demonstrate all-optical linear polarization control of exciton-polariton condensates in anisotropic elliptical optical traps. The cavity inherent TE-TM splitting lifts the ground state spin degeneracy with emerging fine structure modes polarized parallel and perpendicular to trap major axis condensate populating latter. Our findings show a new type exciting perspectives both spinoptronics studies on extended systems interacting nonlinear elements coupling strength adjustable structure.