Theoretical determination of net radiation force and torque for a spherical particle illuminated by a focused laser beam

J. P. Barton, D. R. Alexander, S. A. Schaub

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Abstract

Series expressions for the net radiation force and torque for a spherical particle illuminated by an arbitrarily defined monochromatic beam are derived utilizing the spherical-particle/arbitrary-beam interaction theory developed in an earlier paper. Calculations of net force and torque are presented for a 5-μm-diam water droplet in air optically levitated by a tightly focused (2 μm beam waist diameter) TEM00-mode argon-ion (λ=0.5145 μm) laser beam for on and off propagation axis, and on and off structural resonance conditions. Several features of these theoretical results are related to corresponding experimental observations.

Original languageEnglish (US)
Pages (from-to)4594-4602
Number of pages9
JournalJournal of Applied Physics
Volume66
Issue number10
DOIs
StatePublished - Dec 1 1989

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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