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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. 12 — Nov. 10, 2009

Minimum-variance Brownian motion control of an optically trapped probe

Yanan Huang, Zhipeng Zhang, and Chia-Hsiang Menq  »View Author Affiliations


Applied Optics, Vol. 48, Issue 30, pp. 5871-5880 (2009)
http://dx.doi.org/10.1364/AO.48.005871


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Abstract

This paper presents a theoretical and experimental investigation of the Brownian motion control of an optically trapped probe. The Langevin equation is employed to describe the motion of the probe experiencing random thermal force and optical trapping force. Since active feedback control is applied to suppress the probe’s Brownian motion, actuator dynamics and measurement delay are included in the equation. The equation of motion is simplified to a first-order linear differential equation and transformed to a discrete model for the purpose of controller design and data analysis. The derived model is experimentally verified by comparing the model prediction to the measured response of a 1.87 μm trapped probe subject to proportional control. It is then employed to design the optimal controller that minimizes the variance of the probe’s Brownian motion. Theoretical analysis is derived to evaluate the control performance of a specific optical trap. Both experiment and simulation are used to validate the design as well as theoretical analysis, and to illustrate the performance envelope of the active control. Moreover, adaptive minimum variance control is implemented to maintain the optimal performance in the case in which the system is time varying when operating the actively controlled optical trap in a complex environment.

© 2009 Optical Society of America

OCIS Codes
(140.7010) Lasers and laser optics : Laser trapping
(230.1040) Optical devices : Acousto-optical devices
(350.4855) Other areas of optics : Optical tweezers or optical manipulation

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: July 7, 2009
Manuscript Accepted: September 21, 2009
Published: October 19, 2009

Virtual Issues
Vol. 4, Iss. 12 Virtual Journal for Biomedical Optics

Citation
Yanan Huang, Zhipeng Zhang, and Chia-Hsiang Menq, "Minimum-variance Brownian motion control of an optically trapped probe," Appl. Opt. 48, 5871-5880 (2009)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ao-48-30-5871

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