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Optical vortex torque measured with optically trapped microbarbells

Weronika Lamperska, Jan Masajada, Sławomir Drobczyński, and Piotr Wasylczyk

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Abstract

Optical vortex beams carry orbital angular momentum and thus exert torque on illuminated objects. A dielectric microtool–a microbarbell–is used in two-laser optical tweezers to measure the torque of a focused optical vortex. The tool was either freely rotating due to the applied torque or set into oscillations by the counteracting force. Four different trapping configurations provided different ways of sensing the torque and gave consistent results. The value of torque was determined by confronting the experimental results with numerical and analytical models.

© 2020 Optical Society of America

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Supplementary Material (3)

NameDescription
Visualization 1       A microbarbell rotating continuously due to the constant torque exerted by the optical vortex. Experiment performed in the optical tweezers setup.
Visualization 2       A microbarbell rotating and stopping alternately due to the periodic torque exerted by the blinking optical vortex. Experiment performed in the optical tweezers setup.
Visualization 3       A microbarbell oscillating due to the constat driving force (from optical vortex) and periodic restoring force (from blinking Gaussian trap). Blinking frequency: 1 Hz. Experiment performed in the optical tweezers setup.

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Equations (3)

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