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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 9 — Apr. 26, 2010
  • pp: 9486–9495

Spatial filtering technique to image and measure two-dimensional near-forward scattering from single particles

Matthew J. Berg, Steven C. Hill, Gorden Videen, and Kristan P. Gurton  »View Author Affiliations

Optics Express, Vol. 18, Issue 9, pp. 9486-9495 (2010)

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This work describes the design and use of an optical apparatus to measure the far-field elastic light-scattering pattern for a single particle over two angular-dimensions. A spatial filter composed of a mirror with a small through-hole is used to enable collection of the pattern uncommonly close to the forward direction; to within tenths of a degree. Minor modifications of the design allow for the simultaneous measurement of a particle’s image along with its two-dimensional scattering pattern. Example measurements are presented involving single micrometer-sized glass spherical particles confined in an electrodynamic trap and a dilute suspension of polystyrene latex particles in water. A small forward-angle technique, called Guinier analysis, is used to determine a particle-size estimate directly from the measured pattern without a priori knowledge of the particle refractive index. Comparison of these size estimates to those obtained by fitting the measurements to Mie theory reveals relative errors as low as 2%.

© 2010 Optical Society of America

OCIS Codes
(010.1110) Atmospheric and oceanic optics : Aerosols
(070.6110) Fourier optics and signal processing : Spatial filtering
(290.4020) Scattering : Mie theory
(290.5820) Scattering : Scattering measurements
(290.5850) Scattering : Scattering, particles
(290.2558) Scattering : Forward scattering

ToC Category:

Original Manuscript: February 22, 2010
Revised Manuscript: April 2, 2010
Manuscript Accepted: April 7, 2010
Published: April 21, 2010

Matthew J. Berg, Steven C. Hill, Gorden Videen, and Kristan P. Gurton, "Spatial filtering technique to image and measure two-dimensional near-forward scattering from single particles," Opt. Express 18, 9486-9495 (2010)

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