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Proceedings Paper

Measurement and accumulation of electric charge on a single dielectric particle trapped in air
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Paper Abstract

Normally occurring charges on small particles provide a means to control the motion of the particles. Using a piezoelectric transducer to launch microparticles into a trap, we can vary particle-surface interactions to transfer charge to the particle via contact electrification. This allows more detailed studies of contact electrification itself as well generation of higher charge states for precision measurements of force or nonlinear dynamics using electric field modulation. In practice, particles may be repeatedly landed on the substrate and relaunched during loading. This leads to charge transfer so that the net charge on the polystyrene (PS) particle becomes sufficient to allow electrostatic forcing to drive ballistic motion over a range of displacement two orders of magnitude greater than thermal fluctuations. An increase in charge from 1000 to 3000 electrons is demonstrated and the induced motion of the trapped particle is accurately described using simple classical mechanics in phase space.

Paper Details

Date Published: 4 March 2016
PDF: 7 pages
Proc. SPIE 9764, Complex Light and Optical Forces X, 97640L (4 March 2016); doi: 10.1117/12.2213055
Show Author Affiliations
Haesung Park, National Institute of Standards and Technology (United States)
Thomas W. LeBrun, National Institute of Standards and Technology (United States)

Published in SPIE Proceedings Vol. 9764:
Complex Light and Optical Forces X
Jesper Glückstad; David L. Andrews; Enrique J. Galvez, Editor(s)

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