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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. 29, Iss. 3 — Mar. 1, 2012
  • pp: 407–414

Radiation forces on a microsphere in an arbitrary refractive index profile

Kang Soo Lee, Sang Youl Yoon, Kyung Heon Lee, Sang Bok Kim, Hyung Jin Sung, and Sang Soo Kim  »View Author Affiliations


JOSA B, Vol. 29, Issue 3, pp. 407-414 (2012)
http://dx.doi.org/10.1364/JOSAB.29.000407


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Abstract

The force equations describing the radiation forces on a microsphere in an arbitrary refractive index profile are derived here by using the photon-stream method in a ray-optics regime. A loosely focused Gaussian beam was employed as the radiating illumination beam. The radiation forces on a spherical microsphere were calculated in a time-varying refractive index profile. The refractive index profile of the surrounding medium was evaluated according to the concentration distribution obtained from the diffusion equation. The scattering and gradient forces on a microsphere were calculated for different refractive indices (1.22, 1.33, 1.43, and 1.59), and the radiation forces on a perfectly reflecting microsphere were calculated. The results were compared with previous results to validate the derivation.

© 2012 Optical Society of America

OCIS Codes
(080.0080) Geometric optics : Geometric optics
(080.5692) Geometric optics : Ray trajectories in inhomogeneous media

History
Original Manuscript: September 27, 2011
Revised Manuscript: December 1, 2011
Manuscript Accepted: December 1, 2011
Published: February 22, 2012

Citation
Kang Soo Lee, Sang Youl Yoon, Kyung Heon Lee, Sang Bok Kim, Hyung Jin Sung, and Sang Soo Kim, "Radiation forces on a microsphere in an arbitrary refractive index profile," J. Opt. Soc. Am. B 29, 407-414 (2012)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-29-3-407

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