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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 11 — May. 24, 2010
  • pp: 11785–11790

Particle tracking stereomicroscopy in optical tweezers: Control of trap shape

Richard Bowman, Graham Gibson, and Miles Padgett  »View Author Affiliations


Optics Express, Vol. 18, Issue 11, pp. 11785-11790 (2010)
http://dx.doi.org/10.1364/OE.18.011785


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Abstract

We present an optical system capable of generating stereoscopic images to track trapped particles in three dimensions. Two-dimensional particle tracking on each image yields three dimensional position information. Our approach allows the use of a high numerical aperture (NA= 1.3) objective and large separation angle, such that particles can be tracked axially with resolution of 3nm at 340Hz. Spatial Light Modulators (SLMs), the diffractive elements used to steer and split laser beams in Holographic Optical Tweezers, are also capable of more general operations. We use one here to vary the ratio of lateral to axial trap stiffness by changing the shape of the beam at the back aperture of the microscope objective. Beams which concentrate their optical power at the extremes of the back aperture give rise to much more efficient axial trapping. The flexibility of using an SLM allows us to create multiple traps with different shapes.

© 2010 Optical Society of America

OCIS Codes
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(140.7010) Lasers and laser optics : Laser trapping
(230.6120) Optical devices : Spatial light modulators
(350.4855) Other areas of optics : Optical tweezers or optical manipulation

ToC Category:
Optical Trapping and Manipulation

History
Original Manuscript: March 9, 2010
Revised Manuscript: May 11, 2010
Manuscript Accepted: May 17, 2010
Published: May 19, 2010

Virtual Issues
Vol. 5, Iss. 10 Virtual Journal for Biomedical Optics

Citation
Richard Bowman, Graham Gibson, and Miles Padgett, "Particle tracking stereomicroscopy in optical tweezers: Control of trap shape," Opt. Express 18, 11785-11790 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-11-11785


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