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Parameter exploration of optically trapped liquid aerosols

D. R. Burnham1,2,*, P. J. Reece1,†, and D. McGloin2

  • 1SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, Fife KY16 9SS, United Kingdom
  • 2SUPA, Electronic Engineering and Physics Division, University of Dundee, Nethergate, Dundee DD1 4HN, United Kingdom

  • *Present address: Department of Chemistry, University of Washington, Box 351700, Seattle, WA 98195-1700, USA.
  • †Also at School of Physics, The University of New South Wales, Sydney, NSW 2052, Australia.
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Phys. Rev. E 82, 051123 – Published 17 November, 2010

DOI: https://doi.org/10.1103/PhysRevE.82.051123

Abstract

When studying the motion of optically trapped particles on the microsecond time scale, in low-viscosity media such as air, inertia cannot be neglected. Resolution of unusual and interesting behavior not seen in colloidal trapping experiments is possible. In an attempt to explain the phenomena we use power-spectral methods to perform a parameter study of the Brownian motion of optically trapped liquid aerosol droplets concentrated around the critically damped regime. We present evidence that the system is suitably described by a simple harmonic oscillator model which must include a description of Faxén’s correction, but not necessarily frequency dependent hydrodynamic corrections to Stokes’ law. We also provide results describing how the system behaves under several variables and discuss the difficulty in decoupling the parameters responsible for the observed behavior. We show that due to the relatively low dynamic viscosity and high trap stiffness, it is easy to transfer between over- and underdamped motion by experimentally altering either trap stiffness or damping. Our results suggest stable aerosol trapping may be achieved in underdamped conditions, but the onset of deleterious optical forces at high trapping powers prevents the probing of the upper stability limits due to Brownian motion.

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Phys. Rev. E 82, 051123– Published 17 November, 2010
  • Received 28 June 2010

© 2010 American Physical Society

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