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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 21 — Oct. 13, 2008
  • pp: 16390–16403

Broadband Mie scattering from optically levitated aerosol droplets using a white LED

A. D. Ward, M. Zhang, and O. Hunt  »View Author Affiliations

Optics Express, Vol. 16, Issue 21, pp. 16390-16403 (2008)

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We describe a simple and efficient means of using a white LED source to illuminate an optically levitated aerosol droplet to enable study of broadband Mie scattering. The backscattered resonances are imaged through a spectrograph and CCD which show high resolution Mie scattering intensity distributions across a spectral range of 480 to 700 nm. The wide spectral range allows assignment of resonance mode numbers and mode orders using conventional Mie theory calculations. Accurate droplet sizing, within ±2 nm, is possible for water–based droplets with radii between 2 µm and 8 µm. We additionally demonstrate that the refractive index dispersion can be determined from a single refractive index value at known wavelength. Finally, morphological droplet dynamics are presented showing non-linear droplet evaporation behaviour at a temporal resolution of 100 milliseconds.

© 2008 Optical Society of America

OCIS Codes
(010.1110) Atmospheric and oceanic optics : Aerosols
(290.4020) Scattering : Mie theory
(300.0300) Spectroscopy : Spectroscopy
(350.4855) Other areas of optics : Optical tweezers or optical manipulation

ToC Category:

Original Manuscript: August 5, 2008
Revised Manuscript: September 18, 2008
Manuscript Accepted: September 24, 2008
Published: September 29, 2008

Virtual Issues
Vol. 3, Iss. 12 Virtual Journal for Biomedical Optics

A. D. Ward, M. Zhang, and O. Hunt, "Broadband Mie scattering from optically levitated aerosol droplets using a white LED," Opt. Express 16, 16390-16403 (2008)

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