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VOLUME 58 (1993) | ISSUE 2 | PAGE 145
High frequency stochastic resonance in periodically driven systems
High frequency stochastic resonance (SB.) phenomena, associated with fluc-tuational transitions between coexisting periodic attractors, have been investigated experimentally in an electronic model of a single-well Duffing oscillator bistable in a nearly resonant field of frequency шр. It is shown that, with increasing noise intensity, the signal/noise ratio (SNR) for a signal due to a weak trial force of frequency Π ~ ωρ at first decreases, then increases, and finally decreases again at higher noise intensities: behaviour similar to that observed previously for conventional (low frequency) SR. in systems with static bistable potentials. The stochastic enhancement of the SNR of an additional signal at the mirror-reflected frequency |П —2o>jr| is also observed, in accordance with theoretical predictions. Relationships with phenomena in nonlinear optics are discussed.