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Abstract: The force field of optical tweezers is commonly assumed to be conservative,neglecting the complex action of the scattering force. Using a novel methodthat extracts local forces from trajectories of an optically trapped particle,we measure the three dimensional force field experienced by a Rayleigh particlewith 10 nm spatial resolution and femtonewton precision in force. We find thatthe force field is nonconservative with the nonconservative componentincreasing radially away from the optical axis, in agreement with the Gaussianbeam model of the optical trap. Together with thermal position fluctuations ofthe trapped particle, the presence of the nonconservative force can cause acomplex flux of energy into the optical trap depending on the experimentalconditions.



Autor: Pinyu Wu, Rongxin Huang, Christian Tischer, Alexandr Jonas, Ernst-Ludwig Florin

Fuente: https://arxiv.org/



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