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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 37, Iss. 9 — May. 1, 2012
  • pp: 1469–1471

Thermally activated state transition technique for femto-Newton-level force measurement

Feng-Jung Chen, Jhih-Sian Wong, Ken Y. Hsu, and Long Hsu  »View Author Affiliations


Optics Letters, Vol. 37, Issue 9, pp. 1469-1471 (2012)
http://dx.doi.org/10.1364/OL.37.001469


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Abstract

We develop and test a thermally activated state transition technique for ultraweak force measurement. As a force sensor, the technique was demonstrated on a classical Brownian bead immersed in water and restrained by a bistable optical trap. A femto-Newton-level flow force imposed on this sensor was measured by monitoring changes in the transition rates of the bead hopping between two energy states. The treatment of thermal disturbances as a requirement instead of a limiting factor is the major feature of the technique, and provides a new strategy by which to measure other ultraweak forces beyond the thermal noise limit.

© 2012 Optical Society of America

OCIS Codes
(120.3940) Instrumentation, measurement, and metrology : Metrology
(170.4520) Medical optics and biotechnology : Optical confinement and manipulation
(350.4855) Other areas of optics : Optical tweezers or optical manipulation
(120.4880) Instrumentation, measurement, and metrology : Optomechanics

ToC Category:
Medical Optics and Biotechnology

History
Original Manuscript: December 15, 2011
Revised Manuscript: February 17, 2012
Manuscript Accepted: February 21, 2012
Published: April 24, 2012

Citation
Feng-Jung Chen, Jhih-Sian Wong, Ken Y. Hsu, and Long Hsu, "Thermally activated state transition technique for femto-Newton-level force measurement," Opt. Lett. 37, 1469-1471 (2012)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-9-1469


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