Dynamically tuned arrays of polariton parametric oscillators

Optical parametric oscillations (OPOs)-the nonlinear coherent coupling of an optically excited two-particle pump state to signal and idler states correlated in energy-is relevant for optical amplification and generation of correlated photons. OPOs require states with well-defined symmetries and energies; the fine-tuning of material properties and structural dimensions remains a challenge for the realization of scalable OPOs in semiconductor nanostructures. Here we demonstrate a pathway towards arrays of OPOs based on the dynamic control of microcavity exciton-polaritons confined in micrometer-sized intracavity traps by an acoustic wave. The spatially varying strain field of the wave induces state-dependent energy shifts of discrete polariton levels with the appropriate symmetry for OPO triggering. The robustness of the dynamic acoustic tuning is demonstrated by the synchronous excitation of an array of confined OPOs using a single wave, which thus opens the way for the realization of scalable nonlinear on-chip systems