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Stiffer optical tweezers through real-time feedback control

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4 Author(s)
Wallin, Anders E. ; Department of Physics, P.O. Box 64, 00014, University of Helsinki, Finland ; Ojala, Heikki ; Hæggstrom, Edward ; Tuma, Roman

Your organization might have access to this article on the publisher's site. To check, click on this link:http://dx.doi.org/+10.1063/1.2940339 

Using real-time re-programmable signal processing we connect acousto-optic steering and back-focal-plane interferometric position detection in optical tweezers to create a fast feedback controlled instrument. When trapping 3 μm latex beads in water we find that proportional-gain position-clamping increases the effective lateral trap stiffness ∼13-fold. A theoretical power spectrum for bead fluctuations during position-clamped trapping is derived and agrees with the experimental data. The loop delay, ∼19 μs in our experiment, limits the maximum achievable effective trap stiffness.

Published in:

Applied Physics Letters  (Volume:92 ,  Issue: 22 )

Date of Publication:

Jun 2008

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