Feedback-enhanced sensitivity in optomechanics: Surpassing the parametric instability barrier

Glen I. Harris, Ulrik L. Andersen, Joachim Knittel, Warwick P. Bowen

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Abstract

The intracavity power, and hence sensitivity, of optomechanical sensors is commonly limited by parametric instability. Here we characterize the degradation of sensitivity induced by parametric instability 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 1.9×10-18 mHz-1/2.

Original languageEnglish
JournalPhysical Review A
Volume85
Issue number6
Pages (from-to)061802
ISSN2469-9926
Publication statusPublished - 2012

Bibliographical note

©2012 American Physical Society

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