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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 4 — Feb. 20, 2006
  • pp: 1685–1699

Escape trajectories of single-beam optically trapped micro-particles in a transverse fluid flow

Fabrice Merenda, Gerben Boer, Johann Rohner, Guy Delacrétaz, and René-Paul Salathé  »View Author Affiliations

Optics Express, Vol. 14, Issue 4, pp. 1685-1699 (2006)

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We have studied the transverse and axial equilibrium positions of dielectric micro-spheres trapped in a single-beam gradient optical trap and exposed to an increasing fluid flow transverse to the trapping beam axis. It is demonstrated that the axial equilibrium position of a trapped micro-sphere is a function of its transverse position in the trapping beam. Moreover, although the applied drag-force acts perpendicularly to the beam axis, reaching a certain distance r0 from the beam axis (r0/a ≃ 0.6, a being the sphere radius) the particle escapes the trap due to a breaking axial equilibrium before the actual maximum transverse trapping force is reached. The comparison between a theoretical model and the measurements shows that neglecting these axial equilibrium considerations leads to a theoretical overestimation in the maximal optical transverse trapping forces of up to 50%.

© 2006 Optical Society of America

OCIS Codes
(140.7010) Lasers and laser optics : Laser trapping
(170.4520) Medical optics and biotechnology : Optical confinement and manipulation

ToC Category:

Original Manuscript: January 4, 2006
Revised Manuscript: February 3, 2006
Manuscript Accepted: February 10, 2006
Published: February 20, 2006

Virtual Issues
Vol. 1, Iss. 3 Virtual Journal for Biomedical Optics

Fabrice Merenda, Gerben Boer, Johann Rohner, Guy Delacrétaz, and René-Paul Salathé, "Escape trajectories of single-beam optically trapped micro-particles in a transverse fluid flow," Opt. Express 14, 1685-1699 (2006)

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