Demonstration of Motion Transduction Based on Parametrically Coupled Mechanical Resonators

Abstract

Universal sensing of the motion of mechanical resonators with high precision and low backaction is of paramount importance in ultraweak signal detection, which plays a fundamental role in modern physics. Here we present a universal scheme that mechanically transfers the motion of the resonator not directly measurable to the one that can be precisely measured using mechanical frequency conversion. Demonstration of the scheme at room temperature shows that both the motion imprecision and the backaction force are below the intrinsic level of the objective resonator, which agrees well with our theoretical prediction. The scheme developed here provides an effective interface between an arbitrary mechanical resonator and a high quantum efficient displacement sensor, and is expected to find extensive applications in highly demanding mechanical-based force measurements.

Observation of dynamical phase transitions in a topological nanomechanical system

“…Parametric Couplings. To generate the electrostatic forces for parametrical couplings between beams, an AC voltage V j AC (t) and a DC voltage V DC are applied between j-th and (j + 1)-th beam, the coupling as the following form can be generated 28 .…”

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“…Indeed the ability to couple pairs of modes in the same mechanical resonator has recently been the subject of intense interest8252627282930313233343536373839. However, extending this concept to create an array of modes has proved to be prohibitive due to the weaker transduction efficiencies associated with the higher order vibration modes primarily as a consequence of their low quality factors.…”

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