Feedback Enhanced Sensitivity in Optomechanics: Surpassing the Parametric Instability Barrier

Details Feedback Enhanced Sensitivity in Optomechanics: Surpassing the Parametric Instability Barrier Feedback Enhanced Sensitivity in Optomechanics: Surpassing the Parametric Instability Barrier

2011-09-12

arxiv.org/abs/1109.2381v1

Physics

Quantum Physics

4 pages, 4 figures

Scientific paper

The intracavity power, and hence sensitivity, of optomechanical sensors is commonly limited by parametric instability. Here we characterize the parametric instability induced sensitivity degradation in a micron scale cavity optomechanical system. Feedback via optomechanical transduction and electrical gradient force actuation is applied to suppress the parametric instability. As a result a 5.4 fold increase in mechanical motion transduction sensitivity is achieved to a final value of $1.9\times 10^{-18}\rm m Hz^{-1/2}$.

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