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Measurement of particle motion in optical tweezers embedded in a Sagnac interferometer

Artikel i vetenskaplig tidskrift
Författare Ivan Galinskiy
Oscar Isaksson
Israel Rebolledo Salgado
Mathieu Hautefeuille
Bernhard Mehlig
Dag Hanstorp
Publicerad i Optics Express
Volym 23
Sidor 27071-27084
ISSN 1094-4087
Publiceringsår 2015
Publicerad vid Institutionen för fysik (GU)
Sidor 27071-27084
Språk en
Länkar dx.doi.org/10.1364/OE.23.027071
Ämneskategorier Fysik

Sammanfattning

We have constructed a counterpropagating optical tweezers setup embedded in a Sagnac interferometer in order to increase the sensitivity of position tracking for particles in the geometrical optics regime. Enhanced position determination using a Sagnac interferometer has previously been described theoretically by Taylor et al. [Journal of Optics 13, 044014 (2011)] for Rayleigh-regime particles trapped in an antinode of a standing wave. We have extended their theory to a case of arbitrarily-sized particles trapped with orthogonally-polarized counter-propagating beams. The working distance of the setup was sufficiently long to optically induce particle oscillations orthogonally to the axis of the tweezers with an auxiliary laser beam. Using these oscillations as a reference, we have experimentally shown that Sagnac-enhanced back focal plane interferometry is capable of providing an improvement of more than 5 times in the signal-to-background ratio, corresponding to a more than 30-fold improvement of the signal-to-noise ratio. The experimental results obtained are consistent with our theoretical predictions. In the experimental setup, we used a method of optical levitator-assisted liquid droplet delivery in air based on commercial inkjet technology, with a novel method to precisely control the size of droplets.

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