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Sagnac interferometer-enhanced particle tracking in optical tweezers

Taylor, Michael A; Knittel, Joachim; Hsu, Magnus; Bachor, Hans; Bowen, Warwick


A set-up is proposed to enhance tracking of very small particles, by using optical tweezers embedded within a Sagnac interferometer. The achievable signal-to-noise ratio is shown to be enhanced over that for standard back-focal-plane interferometry. The enhancement factor increases asymptotically as the interferometer visibility approaches 100%, but is capped at a maximum given by four times the ratio of the trapping field intensity to the detector saturation threshold. For an achievable...[Show more]

CollectionsANU Research Publications
Date published: 2011
Type: Journal article
Source: Journal of Optics
DOI: 10.1088/2040-8978/13/4/044014


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