TITLE

Force sensing with an optically levitated charged nanoparticle

AUTHOR(S)
Hempston, David; Vovrosh, Jamie; Toroš, Marko; Winstone, George; Rashid, Muddassar; Ulbricht, Hendrik
PUB. DATE
September 2017
SOURCE
Applied Physics Letters;9/25/2017, Vol. 111 Issue 13, p133111-1
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
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, ωAC, and the frequency of the levitated mechanical oscillator, ω0, converge. We directly measure a force of 3.0±1.5 x 10–20N with 10 s integration time, at a centre of mass temperature of 3 K and at a pressure of 1.6 x 10–5 mbar.
ACCESSION #
125442736

 

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