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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 15 — Jul. 24, 2006
  • pp: 6963–6970

Measurement of the total optical angular momentum transfer in optical tweezers

Simon Parkin, Gregor Knüner, Timo A. Nieminen, Norman R. Heckenberg, and Halina Rubinsztein-Dunlop  »View Author Affiliations

Optics Express, Vol. 14, Issue 15, pp. 6963-6970 (2006)

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We describe a way to determine the total angular momentum, both spin and orbital, transferred to a particle trapped in optical tweezers. As an example an LG02 mode of a laser beam with varying degrees of circular polarisation is used to trap and rotate an elongated particle with a well defined geometry. The method successfully estimates the total optical torque applied to the particle. For this technique, there is no need to measure the viscous drag on the particle, as it is an optical measurement. Therefore, knowledge of the particle’s size and shape, as well as the fluid’s viscosity, is not required.

© 2006 Optical Society of America

OCIS Codes
(140.7010) Lasers and laser optics : Laser trapping
(260.5430) Physical optics : Polarization
(290.5850) Scattering : Scattering, particles

ToC Category:

Original Manuscript: May 15, 2006
Revised Manuscript: July 5, 2006
Manuscript Accepted: July 5, 2006
Published: July 24, 2006

Virtual Issues
Vol. 1, Iss. 8 Virtual Journal for Biomedical Optics

Simon Parkin, Gregor Knöner, Timo A. Nieminen, Norman R. Heckenberg, and Halina Rubinsztein-Dunlop, "Measurement of the total optical angular momentum transfer in optical tweezers," Opt. Express 14, 6963-6970 (2006)

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