  We explore the dynamics of spontaneous breakdown of mirror symmetry in a pair
of identical optomechanical cavities symmetrically coupled to a waveguide.
Large optical intensities enable optomechanically-induced nonlinear detuning of
the optical resonators, resulting in a pitchfork bifurcation. We investigate
the stability of this regime and explore the possibility of inducing
multistability. By injecting proper trigger pulses, the proposed structure can
toggle between two asymmetric stable states, thus serving as a low-noise
nanophotonic all-optical switch or memory element.
