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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 8, Iss. 2 — Mar. 4, 2013

Optimizing bead size reduces errors in force measurements in optical traps

Rebecca K. Montange, Matthew S. Bull, Elisabeth R. Shanblatt, and Thomas T. Perkins  »View Author Affiliations


Optics Express, Vol. 21, Issue 1, pp. 39-48 (2013)
http://dx.doi.org/10.1364/OE.21.000039


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Abstract

Optical traps are used to measure force (F) over a wide range (0.01 to 1,000 pN). Variations in bead radius (r) hinder force precision since trap stiffness (ktrap) varies as r3 when r is small. Prior work has shown ktrap is maximized when r is approximately equal to the beam waist (w0), which on our instrument was ~400 nm when trapping with a 1064-nm laser. In this work, we show that by choosing rw0, we improved the force precision by 2.8-fold as compared to a smaller bead (250 nm). This improvement in force precision was verified by pulling on a canonical DNA hairpin. Thus, by using an optimum bead size, one can simultaneously maximize ktrap while minimizing errors in F.

© 2013 OSA

OCIS Codes
(140.7010) Lasers and laser optics : Laser trapping
(170.0170) Medical optics and biotechnology : Medical optics and biotechnology
(350.4855) Other areas of optics : Optical tweezers or optical manipulation

ToC Category:
Optical Trapping and Manipulation

History
Original Manuscript: September 18, 2012
Revised Manuscript: December 12, 2012
Manuscript Accepted: December 13, 2012
Published: January 2, 2013

Virtual Issues
Vol. 8, Iss. 2 Virtual Journal for Biomedical Optics

Citation
Rebecca K. Montange, Matthew S. Bull, Elisabeth R. Shanblatt, and Thomas T. Perkins, "Optimizing bead size reduces errors in force measurements in optical traps," Opt. Express 21, 39-48 (2013)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=oe-21-1-39


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