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Calculation of the torque on dielectric elliptical cylinders
Auteur(s)
Rockstuhl, Carsten
Herzig, Hans-Peter
Date de parution
2005
In
Journal of the Optical Society of America A, Optical Society of America, 2005/22/1/109-116
Résumé
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.
Identifiants
Autre version
http://josaa.osa.org/abstract.cfm?id=82135
Type de publication
journal article
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