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Published in

Optica, Optics Express, 7(21), p. 8018, 2013

DOI: 10.1364/oe.21.008018

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Optical lock-in particle tracking in optical tweezers

Journal article published in 2013 by Michael A. Taylor ORCID, Joachim Knittel, Warwick P. Bowen
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

We demonstrate a lock-in particle tracking scheme in optical tweezers based on stroboscopic modulation of an illuminating optical field. This scheme is found to evade low frequency noise sources while otherwise producing an equivalent position measurement to continuous measurement. This was demonstrated, and found to yield on average 20dB of noise suppression in the frequency range 10-5000 Hz, where low frequency laser noise and electronic noise was significant, and 35 dB of noise suppression in the range 550-710 kHz where laser relaxation oscillations introduced laser noise. The setup is simple, and compatible with any trapping optics.