Optical position clamping with predictive control

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Appl. Phys. Lett. 95, 181104 (2009)

Title: Optical position clamping with predictive control
Author: Ojala, Heikki; Korsbäck, Anders; Wallin, Anders E.; Hæggström, Edward
Abstract: We increase the effective stiffness of optical tweezers by position clamping a polystyrene bead with a predictive feedback control algorithm. This algorithm mitigates the effect of feedback loop delay. Hence, higher gain than with proportional control can be employed, which results in higher effective trap stiffness, without trap instability. In experiments (initial trap stiffness 0.056 pN/nm with a 1.78 μm diameter polystyrene bead) predictive control increased the effective trap stiffness by 55% relative to proportional control. We also derive theoretical expressions for the power spectra of the bead position controlled by our algorithm.
Description: The following article appeared in (Appl. Phys. Lett. 95, 181104 (2009)) and may be found at http://link.aip.org/link/?apl/95/181104
URI: http://link.aip.org/link/?apl/95/181104
Date: 2009-11-04
Subject: optical tweezers
feedback control
radiation pressure
acousto-optic deflectors
Rights: Copyright (2009) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

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