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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 3 — Jan. 20, 2007
  • pp: 405–412

Dual-trap technique for reduction of low-frequency noise in force measuring optical tweezers

Markus Klein, Magnus Andersson, Ove Axner, and Erik Fällman  »View Author Affiliations


Applied Optics, Vol. 46, Issue 3, pp. 405-412 (2007)
http://dx.doi.org/10.1364/AO.46.000405


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Abstract

High-resolution long-time force measurements by optical tweezers are often limited by low- frequency ( 1 / f ) noise. A dual-trap technique is presented that can reduce such noise in the force signal. It incorporates a second trap (a reference trap) that probes the noise in the system and it is based upon the assumption that the low-frequency parts of the noise from the two traps are correlated. A subtraction of the low-frequency signal from the reference trap from the signal from the force measuring trap will therefore yield a net signal that is significantly less influenced by noise. It is shown that this dual-trap technique can reduce the noise in the force signal up to 60% depending on detection bandwidth.

© 2007 Optical Society of America

OCIS Codes
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation
(140.7010) Lasers and laser optics : Laser trapping
(170.4520) Medical optics and biotechnology : Optical confinement and manipulation

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: May 4, 2006
Revised Manuscript: September 14, 2006
Manuscript Accepted: September 16, 2006
Published: January 4, 2007

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

Citation
Markus Klein, Magnus Andersson, Ove Axner, and Erik Fällman, "Dual-trap technique for reduction of low-frequency noise in force measuring optical tweezers," Appl. Opt. 46, 405-412 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-3-405


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