Abstract
The response of a bistable system driven by a rapidly varying time periodic field or noise, to a low frequency weak pumping field at its subharmonic is examined. We show that sustained oscillation at the subharmonic frequency of the weak field can be generated for an optimal strength of rapidly varying field or noise that takes care of detuning arising out of amplitude dependence of frequency due to nonlinearity of the system and when the strength of the pumping field is set above a critical threshold. Our theoretical analysis is corroborated by detailed numerical simulations.
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