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'Lissajous-like' trajectories in optical tweezers
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SYSNO ASEP 0467069 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title 'Lissajous-like' trajectories in optical tweezers Author(s) Hay, R. F. (GB)
Gibson, G. M. (GB)
Simpson, Stephen Hugh (UPT-D) RID, SAI
Padgett, M. J. (GB)
Phillips, D. B. (GB)Number of authors 5 Source Title Optics Express. - : Optical Society of America - ISSN 1094-4087
Roč. 23, č. 25 (2015), s. 31716-31727Number of pages 12 s. Publication form Print - P Language eng - English Country US - United States Keywords low Reynolds number ; particles ; force Subject RIV BH - Optics, Masers, Lasers Institutional support UPT-D - RVO:68081731 UT WOS 000366687200010 EID SCOPUS 84959378213 DOI 10.1364/OE.23.031716 Annotation When a microscopic particle moves through a low Reynolds number fluid, it creates a flow-field which exerts hydrodynamic forces on surrounding particles. In this work we study the 'Lissajous-like' trajectories of an optically trapped 'probe' microsphere as it is subjected to time-arying oscillatory hydrodynamic flow-fields created by a nearby moving particle (the 'actuator'). We show a breaking of time-reversal symmetry in the motion of the probe when the driving motion of the actuator is itself time-reversal symmetric. This symmetry breaking results in a fluid-pumping effect, which arises due to the action of both a time-dependent hydrodynamic flow and a position-dependent optical restoring force, which together determine the trajectory of the probe particle. We study this situation experimentally, and show that the form of the trajectories observed is in good agreement with Stokesian dynamics simulations. Our results are related to the techniques of active micro-rheology and flow measurement, and also highlight how the mere presence of an optical trap can perturb the environment it is in place to measure. Workplace Institute of Scientific Instruments Contact Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178 Year of Publishing 2017
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