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(Color online) (a) Measurement of the bistability region. (b) Pump amplitude hysteresis loop for a constant pump frequency of [the broken line in (a)]. The vertical arrows show the response to a small AM (horizontal arrow).
(Color online) Experimental setup. The device consists of a suspended doubly clamped nanomechanical resonator. The resonator is excited by two arbitrary waveform generators (one is used for the pump and the other for the noise). Resonator’s vibrations are detected optically. The inset shows an electron micrograph of the device.
(Color online) Panels (a)–(e) exhibit typical snapshots of resonator’s response in the time domain (left) and in the frequency domain (right) as the input voltage noise intensity is increased. The dotted line in the time domain represents the modulation signal.
(Color online) [(a) and (b)] Spectral amplification ( and ) vs voltage noise intensity. (c) The spectral amplification vs noise intensity for three AM frequencies. (d) Measurement of the probability density , where is the difference between the time of the transition and the time at which the modulation amplitude gets its maximal value.
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