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Proceedings Paper

Electrically driven, optically levitated micro-gyroscopes (Conference Presentation)
Author(s): Alexander Rider; Charles Preston Blakemore

Paper Abstract

I describe the electrically-driven rotation of 2.4-micron-radius, optically levitated dielectric microspheres. Electric fields are used to apply torques to a microsphere's permanent electric dipole moment, while angular displacement is measured by detecting the change in polarization state of light transmitted through the microsphere. This technique enables greater control than previously achieved with purely optical means. We measure the spin-down of a microsphere released from a rotating electric field, the harmonic motion of the dipole relative to the instantaneous direction of the field, and the phase lag between the driving electric field and the dipole moment of the MS due to drag from residual gas. We also observe the gyroscopic precession of the MS when the axis of rotation of the driving field and the angular momentum of the microsphere are orthogonal. These observations are in quantitative agreement with the equation of motion.

Paper Details

Date Published: 9 September 2019
Proc. SPIE 11083, Optical Trapping and Optical Micromanipulation XVI, 110831A (9 September 2019); doi: 10.1117/12.2531128
Show Author Affiliations
Alexander Rider, Stanford Univ. (United States)
Charles Preston Blakemore, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 11083:
Optical Trapping and Optical Micromanipulation XVI
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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