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Diniz K, Dutra RS, Pires LB, et al. Negative optical torque on a microsphere in optical tweezers. Opt Express. 2019;27(5):5905-5917doi: 10.1364/OE.27.005905.
Diniz, K., Dutra, R. S., Pires, L. B., Viana, N. B., Nussenzveig, H. M., & Maia Neto, P. A. (2019). Negative optical torque on a microsphere in optical tweezers. Optics express, 27(5), 5905-5917. https://doi.org/10.1364/OE.27.005905
Diniz, K, et al. "Negative optical torque on a microsphere in optical tweezers." Optics express vol. 27,5 (2019): 5905-5917. doi: https://doi.org/10.1364/OE.27.005905
Diniz K, Dutra RS, Pires LB, Viana NB, Nussenzveig HM, Maia Neto PA. Negative optical torque on a microsphere in optical tweezers. Opt Express. 2019 Mar 04;27(5):5905-5917. doi: 10.1364/OE.27.005905. PMID: 30876186.
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Opt Express. 2019 Mar 04;27(5):5905-5917. doi: 10.1364/OE.27.005905.

Negative optical torque on a microsphere in optical tweezers.

Optics express

K Diniz, R S Dutra, L B Pires, N B Viana, H M Nussenzveig, P A Maia Neto

PMID: 30876186 DOI: 10.1364/OE.27.005905

Abstract

We show that the optical force field in optical tweezers with elliptically polarized beams has the opposite handedness for a wide range of particle sizes and for the most common configurations. Our method is based on the direct observation of the particle equilibrium position under the effect of a transverse Stokes drag force, and its rotation around the optical axis by the mechanical effect of the optical torque. We find overall agreement with theory, with no fitting, provided that astigmatism, which is characterized separately, is included in the theoretical description. Our work opens the way for characterization of the trapping parameters, such as the microsphere complex refractive index and the astigmatism of the optical system, from measurements of the microsphere rotation angle.

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