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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 13 — Jun. 23, 2008
  • pp: 9306–9317

Theory of dielectric micro-sphere dynamics in a dual-beam optical trap

M. Kawano, J. T. Blakely, R. Gordon, and D. Sinton  »View Author Affiliations


Optics Express, Vol. 16, Issue 13, pp. 9306-9317 (2008)
http://dx.doi.org/10.1364/OE.16.009306


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Abstract

We investigate the dynamics of an array of polystyrene micron-sized spheres in a dual-beam fiber-optic trap. Experimental results show non-uniform equilibrium particle spacing and spontaneous self-sustained oscillation for large particle numbers. Results are analyzed with a Maxwell-Stress Tensor method using the Generalized Multipole Technique, where hydrodynamic interactions between particles are included. The theoretical analysis matches well with the experimentally observed equilibrium particle spacing. The theory shows that an offset in the trapping beams is the underlying mechanism for the oscillations and influences both the oscillation frequency and the damping rate for oscillations. The theory presented is of general interest to other systems involving multi-particle optical interactions.

© 2008 Optical Society of America

OCIS Codes
(140.7010) Lasers and laser optics : Laser trapping
(170.4520) Medical optics and biotechnology : Optical confinement and manipulation
(290.5850) Scattering : Scattering, particles

ToC Category:
Optical Trapping and Manipulation

History
Original Manuscript: April 22, 2008
Revised Manuscript: May 29, 2008
Manuscript Accepted: June 5, 2008
Published: June 9, 2008

Virtual Issues
Vol. 3, Iss. 7 Virtual Journal for Biomedical Optics

Citation
M. Kawano, J. T. Blakely, R. Gordon, and D. Sinton, "Theory of dielectric micro-sphere dynamics in a dual-beam optical trap," Opt. Express 16, 9306-9317 (2008)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-13-9306


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