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Synchronization of colloidal rotors through angular optical binding
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SYSNO ASEP 0464941 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Synchronization of colloidal rotors through angular optical binding Author(s) Simpson, Stephen Hugh (UPT-D) RID, SAI
Chvátal, Lukáš (UPT-D) RID, ORCID, SAI
Zemánek, Pavel (UPT-D) RID, SAI, ORCIDNumber of authors 3 Source Title Physical Review A. - : American Physical Society - ISSN 2469-9926
Roč. 93, č. 2 (2016), 023842:1-12Number of pages 12 s. Language eng - English Country US - United States Keywords hydrodynamic properties ; colloidal rotors ; angular optical binding Subject RIV BH - Optics, Masers, Lasers R&D Projects GB14-36681G GA ČR - Czech Science Foundation (CSF) Institutional support UPT-D - RVO:68081731 UT WOS 000370840200013 EID SCOPUS 84959498117 DOI 10.1103/PhysRevA.93.023842 Annotation A mechanism for the synchronization of driven colloidal rotors via optical coupling torques is presented and analyzed. Following our recent experiments [Brzobohaty et al., Opt. Express 23, 7273 (2015)], we consider a counterpropagating optical beam trap that carries spin angular momentum, but no net linear momentum, operating in an aqueous solvent. The angular momentum carried by the beams causes the continuous low-Reynolds-number rotation of spheroidal colloids. Due to multiple scattering, the optical torques experienced by these particles depend on their relative orientations, while the effect of hydrodynamic interaction is negligible. This results in frequency pulling, which causes weakly dissimilar spheroids to synchronize their rotation rates and lock their relative phases. The effect is qualitatively captured by a coupled dipole model and quantitatively reproduced by T -matrix calculations. For pairs of rotors, the relative torque Delta tau is shown to vary with relative phase Delta phi according to Delta tau approximate to A sin(2 Delta phi + delta) + B for constants A, B, delta, so the resulting motion is governed by the well-known Adler equation. We show that this behavior can be preserved for larger numbers of particles. The application of these phenomena to the inertial motion of particles in vacuum could provide a route to the sympathetic cooling of mesoscopic particles. Workplace Institute of Scientific Instruments Contact Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178 Year of Publishing 2017
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