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16 September 2014 Investigating hydrodynamic synchronisation using holographic optical tweezers
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Coordinated motion at low Reynolds number is widely observed in biological micro-systems, but the underlying mechanisms are often unclear. A holographic optical tweezers system is used to experimentally study this phenomenon, by employing optical forces to drive a pair of coplanar microspheres in circular orbits with a constant tangential force. In this system synchronisation is caused by hydrodynamic forces arising from the motion of the two spheres. The timescales of their synchronisation from large initial phase differences are explored and found to be dependent on how stiffly the microspheres are confined to their circular orbits. These measured timescales show good agreement with numerical simulations.
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Stuart Box, Luke Debono, Nicolas Bruot, Jurij Kotar, Pietro Cicuta, Mervyn Miles, Simon Hanna, David Phillips, and Stephen Simpson "Investigating hydrodynamic synchronisation using holographic optical tweezers", Proc. SPIE 9164, Optical Trapping and Optical Micromanipulation XI, 91641Q (16 September 2014);


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