Noise Suppression for Micromechanical Resonator via Intrinsic Dynamic Feedback

Details Noise Suppression for Micromechanical Resonator via Intrinsic Dynamic Feedback Noise Suppression for Micromechanical Resonator via Intrinsic Dynamic Feedback

2007-08-06

arxiv.org/abs/0708.0706v2

Front. Phys. China 3, 294 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 7 figures

Scientific paper

10.1007/s11467-008-0025-z

We study a dynamic mechanism to passively suppress the thermal noise of a micromechanical resonator through an intrinsic self-feedback that is genuinely non-Markovian. We use two coupled resonators, one as the target resonator and the other as an ancillary resonator, to illustrate the mechanism and its noise reduction effect. The intrinsic feedback is realized through the dynamics of coupling between the two resonators: the motions of the target resonator and the ancillary resonator mutually influence each other in a cyclic fashion. Specifically, the states that the target resonator has attained earlier will affect the state it attains later due to the presence of the ancillary resonator. We show that the feedback mechanism will bring forth the effect of noise suppression in the spectrum of displacement, but not in the spectrum of momentum.

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