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Activated switching between two driven oscillation states in a nonlinear micromechanical oscillator (Invited Paper)

We present measurements of noise induced switching for a system far from equilibrium. The system under study is an underdamped micromechanical torsional oscillator driven into the nonlinear regime. Under a sufficiently large periodic driving field, the oscillator has two stable dynamical states with different oscillation amplitudes within a certain range of driving frequencies. We induce the oscillator to escape from one dynamical state into the other by introducing noise in the excitation. By measuring the rate of random transitions as a function of noise intensity, we demonstrate the activated behavior of escape from the high-amplitude state to the low-amplitude state.