TITLE

Optical position clamping with predictive control

AUTHOR(S)
Ojala, Heikki; Korsbäck, Anders; Wallin, Anders E.; Hæggström, Edward
PUB. DATE
November 2009
SOURCE
Applied Physics Letters;11/2/2009, Vol. 95 Issue 18, p181104
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
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.
ACCESSION #
45036558

 

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