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We experimentally study an optomechanical cavity consisting of an oscillatingmechanical resonator embedded in a superconducting microwave transmission linecavity. Tunable optomechanical coupling between the mechanical resonator andthe microwave cavity is introduced by positioning a niobium-coated single modeoptical fiber above the mechanical resonator. The capacitance between themechanical resonator and the coated fiber gives rise to optomechanicalcoupling, which can be controlled by varying the fiber-resonator distance. Westudy radiation pressure induced self-excited oscillations as a function ofmicrowave driving parameters (frequency and power). Intermittency between limitcycle and steady state behaviors is observed with blue-detuned drivingfrequency. The experimental results are accounted for by a model that takesinto account the Duffing-like nonlinearity of the microwave cavity. A stabilityanalysis reveals a subcritical Hopf bifurcation near the region whereintermittency is observed.

Intermittency in an Optomechanical Cavity Near a Subcritical Hopf Bifurcation