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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 17 — Jun. 10, 2008
  • pp: 3196–3202

High trapping forces for high-refractive index particles trapped in dynamic arrays of counterpropagating optical tweezers

Astrid van der Horst, Peter D.J. van Oostrum, Alexander Moroz, Alfons van Blaaderen, and Marileen Dogterom  »View Author Affiliations


Applied Optics, Vol. 47, Issue 17, pp. 3196-3202 (2008)
http://dx.doi.org/10.1364/AO.47.003196


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Abstract

We demonstrate the simultaneous trapping of multiple high-refractive index ( n > 2 ) particles in a dynamic array of counterpropagating optical tweezers in which the destabilizing scattering forces are canceled. These particles cannot be trapped in single-beam optical tweezers. The combined use of two opposing high-numerical aperture objectives and micrometer-sized high-index titania particles yields an at least threefold increase in both axial and radial trap stiffness compared to silica particles under the same conditions. The stiffness in the radial direction is obtained from measured power spectra; calculations are given for both the radial and the axial force components, taking spherical aberrations into account. A pair of acousto-optic deflectors allows for fast, computer-controlled manipulation of the individual trapping positions in a plane, while the method used to create the patterns ensures the possibility of arbitrarily chosen configurations. The manipulation of high-index particles finds its application in, e.g., creating defects in colloidal photonic crystals and in exerting high forces with low laser power in, for example, biophysical experiments.

© 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
(230.1040) Optical devices : Acousto-optical devices

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: November 6, 2007
Revised Manuscript: May 1, 2008
Manuscript Accepted: May 2, 2008
Published: June 5, 2008

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

Citation
Astrid van der Horst, Peter D. J. van Oostrum, Alexander Moroz, Alfons van Blaaderen, and Marileen Dogterom, "High trapping forces for high-refractive index particles trapped in dynamic arrays of counterpropagating optical tweezers," Appl. Opt. 47, 3196-3202 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-17-3196


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