Sensing force gradients with cavity optomechanics while evading backaction

We study force-gradient sensing with a coherently driven mechanical resonator and phase-sensitive detection of motion through the two-tone backaction evading measurement of cavity optomechanics. The response of the optomechanical system, solved by numerical integration of the classical equations of...

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Published in:Physical review. A 2024-10, Vol.110 (4), Article 043524
Main Authors: Arvidsson, Elisabet K., Scarano, Ermes, Roos, August K., Qvarfort, Sofia, Haviland, David B.
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creator Arvidsson, Elisabet K.
Scarano, Ermes
Roos, August K.
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Haviland, David B.
description We study force-gradient sensing with a coherently driven mechanical resonator and phase-sensitive detection of motion through the two-tone backaction evading measurement of cavity optomechanics. The response of the optomechanical system, solved by numerical integration of the classical equations of motion, shows an extended region which is monotonic to changes in force gradient. We use Floquet theory to model the fluctuations, which rise only slightly above that of the usual backaction evading measurement in the presence of the mechanical drive. The monotonic response and minimal backaction are advantageous for applications such as atomic force microscopy.
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title Sensing force gradients with cavity optomechanics while evading backaction
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