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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 4, Iss. 2 — Feb. 10, 2009

Controlled rotation of birefringent particles in an optical trap

Kurt D. Wulff, Daniel G. Cole, and Robert L. Clark  »View Author Affiliations


Applied Optics, Vol. 47, Issue 34, pp. 6428-6433 (2008)
http://dx.doi.org/10.1364/AO.47.006428


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Abstract

Optical traps have been used in a multitude of applications requiring the sensing and application of forces. However, optical traps also have the ability to accurately apply and sense torques. Birefringent particles experience a torque when trapped in elliptically polarized light. By measuring the frequency content of the exiting beam, the rotational rates can be set up in a feedback loop and actively controlled. Here we describe an optical trap with feedback torque control to maintain constant rotational rates despite the introduction of an increased drag on the particle. As a result, this research has the potential to advance the understanding of rotary motor proteins such as F1 ATPase.

© 2008 Optical Society of America

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

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: March 31, 2008
Revised Manuscript: October 24, 2008
Manuscript Accepted: October 25, 2008
Published: November 26, 2008

Virtual Issues
Vol. 4, Iss. 2 Virtual Journal for Biomedical Optics

Citation
Kurt D. Wulff, Daniel G. Cole, and Robert L. Clark, "Controlled rotation of birefringent particles in an optical trap," Appl. Opt. 47, 6428-6433 (2008)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ao-47-34-6428

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