We report the observation of a parametric instability in the out-of-equilibrium steady state of two coupled Kerr microresonators coherently driven by a laser. Using a resonant excitation, we drive the system into an unstable regime, where we observe the appearance of intense and well-resolved sideband modes in the emission spectrum. This feature is a characteristic signature of self-sustained oscillations of the intracavity field. We comprehensively model our findings using semiclassical Langevin equations for the cavity field dynamics combined with a linear stability analysis. The inherent scalability of our semiconductor platform, enriched with a strong Kerr nonlinearity, is promising for the realization of integrated optical parametric oscillator networks.

The Netherlands Organisation for Scientific Research (NWO)
Phys. Rev. A
Interacting Photons

Zambon, N., Rodriguez, S., Lemaître, A., Harouri, A., Le Gratiet, L., Sagnes, I., … Bloch, J. (2020). Parametric instability in coupled nonlinear microcavities. Phys. Rev. A, 102(2), 023526: 1–8. doi:10.1103/physreva.102.023526