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Stiffer optical tweezers through real-time feedback control\ud

By A.E. Wallin, H. Ojala, E. Haeggstrom and R. Tuma

Abstract

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

Publisher: American Institute of Physics
Year: 2008
OAI identifier: oai:eprints.whiterose.ac.uk:4064

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