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9 September 2019 Electrically driven, optically levitated micro-gyroscopes (Conference Presentation)
Alexander Rider, Charles Preston Blakemore
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Proceedings Volume 11083, Optical Trapping and Optical Micromanipulation XVI; 110831A (2019) https://doi.org/10.1117/12.2531128
Event: SPIE Nanoscience + Engineering, 2019, San Diego, California, United States
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.
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Alexander Rider and Charles Preston Blakemore "Electrically driven, optically levitated micro-gyroscopes (Conference Presentation)", Proc. SPIE 11083, Optical Trapping and Optical Micromanipulation XVI, 110831A (9 September 2019); https://doi.org/10.1117/12.2531128
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KEYWORDS
Dielectric polarization
Dielectrics
Motion measurement
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