Microphotography of an electrodynamically levitated microparticle

Stephen Arnold; Lorcan M. Folan

doi:10.1117/12.145698

24 May 1993 Microphotography of an electrodynamically levitated microparticle

Stephen Arnold, Lorcan M. Folan

Proceedings Volume 1862, Laser Applications in Combustion and Combustion Diagnostics; (1993) https://doi.org/10.1117/12.145698
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

Abstract

An electrodynamic levitator-trap (Paul trap) is used at line frequency (i.e. 60 Hz) as a sample cell for the long term microphotography of a microparticle in air at STP. Images are obtained in a trap modified to eliminate stray static fields at its AC 'null' point. Resolution in these long term images is found to be limited principally by stochastic thermal fluctuations and optical diffraction. A stochastic differential equation constructed for describing the particle's motion is found to be in good agreement with imaging experiments. This model provides an optimal limit to which a particle may be localized by increasing the drive potential, and indicates that this limit is a function principally of particle size and temperature. Images taken in fluorescence from a glycerol particle containing a probable surfactant are presented. Polarization resolution of these images clearly shows segregation of the molecule to the surface and identifies the orientation of the molecular emission moment in relation to the surface normal.

Citation Download Citation

Stephen Arnold and Lorcan M. Folan "Microphotography of an electrodynamically levitated microparticle", Proc. SPIE 1862, Laser Applications in Combustion and Combustion Diagnostics, (24 May 1993); https://doi.org/10.1117/12.145698

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