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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry van Driel
  • Vol. 27, Iss. 3 — Mar. 1, 2010
  • pp: 582–591

Observation of bistability of trapping position in aerosol optical tweezers

Kerry J. Knox, Daniel R. Burnham, Lowell I. McCann, Shawntel L. Murphy, David McGloin, and Jonathan P. Reid  »View Author Affiliations


JOSA B, Vol. 27, Issue 3, pp. 582-591 (2010)
http://dx.doi.org/10.1364/JOSAB.27.000582


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Abstract

Bistability in the axial trapping position of aqueous aerosol droplets has been observed for the first time, to our knowledge, in optical tweezers. The behavior has been observed for two distinct trapping configurations, with the trapping beam oriented either along the vertical or horizontal axis. This represents the first report of the optical tweezing of aerosol droplets with a horizontally propagating laser beam. Side imaging was used in conjunction with imaging in the plane of the optical trap. Droplet sizing was performed using cavity-enhanced Raman spectroscopy or by applying a circular regression routine to the acquired images. Predictions from a theoretical model of optical forces are shown to be in good agreement with the experimental observations of bistability in the trapping position. These studies have significance both for the rigorous interpretation of data obtained using aerosol optical tweezers and for the modeling of aerosol optical traps.

© 2010 Optical Society of America

OCIS Codes
(010.1110) Atmospheric and oceanic optics : Aerosols
(290.4020) Scattering : Mie theory
(350.4855) Other areas of optics : Optical tweezers or optical manipulation
(180.5655) Microscopy : Raman microscopy

ToC Category:
Atmospheric and Oceanic Optics

History
Original Manuscript: November 24, 2009
Revised Manuscript: January 11, 2010
Manuscript Accepted: January 22, 2010
Published: February 25, 2010

Citation
Kerry J. Knox, Daniel R. Burnham, Lowell I. McCann, Shawntel L. Murphy, David McGloin, and Jonathan P. Reid, "Observation of bistability of trapping position in aerosol optical tweezers," J. Opt. Soc. Am. B 27, 582-591 (2010)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-27-3-582


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