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The transverse trapping force of an optical trap: factors affecting its measurement

Wright, Amanda J. and Wood, Tiffany A. and Dickinson, Mark R. and Gleeson, Helen F. and Mullin, Tom (2003) The transverse trapping force of an optical trap: factors affecting its measurement. Journal of Modern Optics, 50 (10). pp. 1521-1532. ISSN 0950-0340

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Abstract

We report new observations that question the validity of using the escape method to deduce optical trapping forces in optical tweezers. The results were obtained by measuring the minimum beam power required to trap a particle subject to fluid flow, created by movement of the sample stage. The power was found to increase by approximately 50% over the range of amplitudes of movement used. This suggests that the measured trapping force is not solely dependent upon the velocity of the fluid past the trapped particle, as commonly assumed. These effects were observed at all fluid velocities and accelerations employed. We consider various causes for the observed effects but an explanation remains an outstanding challenge.

Item type: Article
ID code: 5361
Keywords: escape method, optical trapping forces, optical tweezers, Optics. Light, Atomic and Molecular Physics, and Optics
Subjects: Science > Physics > Optics. Light
Department: Faculty of Science > Institute of Photonics
Related URLs:
    Depositing user: Strathprints Administrator
    Date Deposited: 09 Feb 2008
    Last modified: 04 Sep 2014 15:42
    URI: http://strathprints.strath.ac.uk/id/eprint/5361

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