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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Editor: Grover Swartzlander
  • Vol. 30, Iss. 8 — Aug. 1, 2013
  • pp: 2113–2122

Accurate and efficient determination of the radius, refractive index, and dispersion of weakly absorbing spherical particle using whispering gallery modes

Thomas C. Preston and Jonathan P. Reid  »View Author Affiliations

JOSA B, Vol. 30, Issue 8, pp. 2113-2122 (2013)

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We present an algorithm that can be used to simultaneously determine the radius and the refractive index (with dispersion) of a spherical, homogeneous particle. This is accomplished by fitting characteristic resonances calculated using Mie scattering coefficients to the measured whispering gallery mode resonances. The advantage of this algorithm over those that have been presented previously is that a large portion of the search can be reduced to two dimensions (a search that includes radius and refractive index with dispersion will always be at least three dimensions). Using this algorithm, we analyze two large sets of cavity-enhanced Raman spectra from optically trapped aerosol particles. The speed of the algorithm allows for best fits to be found in real time. Precision is found to be limited by the resolution of the spectrograph.

© 2013 Optical Society of America

OCIS Codes
(010.1110) Atmospheric and oceanic optics : Aerosols
(290.3030) Scattering : Index measurements
(290.4020) Scattering : Mie theory
(290.5860) Scattering : Scattering, Raman

ToC Category:
Remote Sensing and Sensors

Original Manuscript: April 12, 2013
Revised Manuscript: May 16, 2013
Manuscript Accepted: June 4, 2013
Published: July 15, 2013

Virtual Issues
Vol. 8, Iss. 9 Virtual Journal for Biomedical Optics

Thomas C. Preston and Jonathan P. Reid, "Accurate and efficient determination of the radius, refractive index, and dispersion of weakly absorbing spherical particle using whispering gallery modes," J. Opt. Soc. Am. B 30, 2113-2122 (2013)

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