We describe a novel method of tracking the rotational motion of clusters of colloidal particles. Our method utilizes rigid body transformations to determine the rotations of a cluster and extends conventional proven particle tracking techniques in a simple way, thus facilitating the study of rotational dynamics in systems containing or composed of colloidal clusters. We test our method by measuring dynamical properties of simulated Brownian clusters under conditions relevant to microscopy experiments. We then use the technique to track and describe the motions of a real colloidal cluster imaged with confocal microscopy. (C) 2011 Optical Society of America
机构:
CNRS, LPTMS, F-91405 Orsay, France
Univ Paris 11, UMR8626, F-91405 Orsay, France
Univ Amsterdam, Van der Waals Zeeman Inst, Inst Phys IoP, Fac Sci FNWI, NL-1098 XH Amsterdam, NetherlandsCNRS, LPTMS, F-91405 Orsay, France
Jabbari-Farouji, S.
Wegdam, G. H.
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机构:
CNRS, LPTMS, F-91405 Orsay, France
Univ Paris 11, UMR8626, F-91405 Orsay, FranceCNRS, LPTMS, F-91405 Orsay, France
Wegdam, G. H.
Bonn, Daniel
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机构:
CNRS, LPTMS, F-91405 Orsay, France
Univ Paris 11, UMR8626, F-91405 Orsay, France
Lab Phys Stat ENS, F-75231 Paris 05, FranceCNRS, LPTMS, F-91405 Orsay, France