Force sensing with an optically levitated charged nanoparticle

Abstract

Levitated optomechanics is showing potential for precise force measurements. Here, we report a case study, to show experimentally the capacity of such a force sensor. Using an electric field as a tool to detect a Coulomb force applied onto a levitated nanosphere. We experimentally observe the spatial displacement of up to 6.6 nm of the levitated nanosphere by imposing a DC field. We further apply an AC field and demonstrate resonant enhancement of force sensing when a driving frequency, ${\omega }_{AC}$, and the frequency of the levitated mechanical oscillator, ${\omega }_0$, converge. We directly measure a force of $3.0\pm 1.5\times 10^{-20}$ N with 10 second integration time, at a centre of mass temperature of 3 K and at a pressure of $1.6\times 10^{-5}$ mbar.

5 pages, 3 figures

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