Counterpropagating Sagnac optical tweezers as an efficient method for 3D trapping in air

Galinskiy, Ivan; Meza, José Luis; Hautefeuille, Mathieu

doi:10.1364/laop.2014.ltu4a.31

Cited by 1 publication

(1 citation statement)

References 2 publications

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“…To address this possibility, we generalized the theory by Taylor et al [23] to arbitrary-size spherical particles in a setup where the counterpropagating beams are orthogonally polarized. After that, we confirmed the enhanced signal-to-noise ratio experimentally, continuing our previous work [6]. The reflections from the particle itself were shown to be detrimental to the signal-to-noise ratio by Taylor et al [23].…”

Section: Introductionsupporting

confidence: 87%

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

Galinskiy¹,

Isaksson²,

Rebolledo-Salgado³

et al. 2015

Opt. Express

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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 counterpropagating 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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Section: Introductionsupporting

confidence: 87%