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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 4, Iss. 10 — Oct. 2, 2009

Interaction of Gaussian beam with near-spherical particle: an analytic–numerical approach for assessing scattering and stresses

Lars Boyde, Kevin J. Chalut, and Jochen Guck  »View Author Affiliations

JOSA A, Vol. 26, Issue 8, pp. 1814-1826 (2009)

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We derive a straightforward theoretical method to determine the electromagnetic fields for the incidence of a monochromatic laser beam on a near-spherical dielectric particle. The beam-shape coefficients are obtained from the radial laser fields and expressed as a finite series in a form that has, to our knowledge, not been published before. Our perturbation approach to solve Maxwell’s equations in spherical coordinates employs two alternative techniques to match the boundary conditions: an analytic approach for small particles with low eccentricity and an adapted point-matching method for larger spheroids with higher aspect ratios. We present results for the internal and external fields, scattering intensities, and stresses exerted on the particle. While similarly accurate as others, our approach is easily implemented numerically and thus particularly useful in praxis, e.g., for analyzing optical traps, such as the optical stretcher.

© 2009 Optical Society of America

OCIS Codes
(140.7010) Lasers and laser optics : Laser trapping
(290.4020) Scattering : Mie theory
(290.5850) Scattering : Scattering, particles
(350.4855) Other areas of optics : Optical tweezers or optical manipulation

ToC Category:
Lasers and Laser Optics

Original Manuscript: May 1, 2009
Manuscript Accepted: June 21, 2009
Published: July 20, 2009

Virtual Issues
Vol. 4, Iss. 10 Virtual Journal for Biomedical Optics

Lars Boyde, Kevin J. Chalut, and Jochen Guck, "Interaction of Gaussian beam with near-spherical particle: an analytic-numerical approach for assessing scattering and stresses," J. Opt. Soc. Am. A 26, 1814-1826 (2009)

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