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

Haesung Park; Thomas W. LeBrun

doi:10.1117/12.2213055

4 March 2016 Measurement and accumulation of electric charge on a single dielectric particle trapped in air

Haesung Park, Thomas W. LeBrun

Proceedings Volume 9764, Complex Light and Optical Forces X; 97640L (2016) https://doi.org/10.1117/12.2213055
Event: SPIE OPTO, 2016, San Francisco, California, United States

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.

Citation Download Citation

Haesung Park and Thomas W. LeBrun "Measurement and accumulation of electric charge on a single dielectric particle trapped in air", Proc. SPIE 9764, Complex Light and Optical Forces X, 97640L (4 March 2016); https://doi.org/10.1117/12.2213055

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