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Proceedings Paper

Microrheology using dual-beam optical tweezers and ultrasensitive force measurements
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Paper Abstract

We investigate the dynamics of microscopic flow vortices. We create flow vortices by rotation of birefringent particles in optical tweezers. We then use either highly sensitive drag force measurements or video tracking to map the fluid velocity around that particle. The results obtained from these different methods are compared. Velocity profiles obtained for water agree very well with theoretical predictions. In contrast, we find a strong deviation of velocity profiles in a complex fluid from those predicted by simple theory.

Paper Details

Date Published: 14 March 2005
PDF: 8 pages
Proc. SPIE 5736, Nanomanipulation with Light, (14 March 2005); doi: 10.1117/12.591183
Show Author Affiliations
Gregor G. Knoener, The Univ. of Queensland (Australia)
Simon John Wyatt Parkin, The Univ. of Queensland (Australia)
Norman R. Heckenberg, The Univ. of Queensland (Australia)
Halina Rubinsztein-Dunlop, The Univ. of Queensland (Australia)

Published in SPIE Proceedings Vol. 5736:
Nanomanipulation with Light
David L. Andrews, Editor(s)

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