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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 22, Iss. 1 — Jan. 1, 2005
  • pp: 109–116

Calculation of the torque on dielectric elliptical cylinders

Carsten Rockstuhl and Hans Peter Herzig  »View Author Affiliations


JOSA A, Vol. 22, Issue 1, pp. 109-116 (2005)
http://dx.doi.org/10.1364/JOSAA.22.000109


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Abstract

We present our investigation of the torque exerted on dielectric elliptical cylinders by highly focused laser beams. The calculations are performed with rigorous diffraction theory, and the size-dependent torque is analyzed as a function of the axis ratio. It is found that highly elongated particles will experience a reversal of the torque for a radius that is approximately one third of the wavelength. This effect is attributed to interference effects inside the structure due to multiple reflections of the incoming wave. The evolution from a perfectly sinusoidal angular dependence of the torque to a more complicated pattern for increasing particle size is presented in detail.

© 2005 Optical Society of America

OCIS Codes
(260.2110) Physical optics : Electromagnetic optics
(290.5850) Scattering : Scattering, particles

History
Original Manuscript: May 17, 2004
Revised Manuscript: July 20, 2004
Published: January 1, 2005

Citation
Carsten Rockstuhl and Hans Peter Herzig, "Calculation of the torque on dielectric elliptical cylinders," J. Opt. Soc. Am. A 22, 109-116 (2005)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-22-1-109

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