Calculation of the torque on dielectric elliptical cylinders.
- Rockstuhl C University of Neuchâtel, Institute of Microtechnology, CH-2000 Neuchâtel, Switzerland. carsten.rockstuhl@unine.ch
- Herzig HP
- 2005-01-27
Published in:
- Journal of the Optical Society of America. A, Optics, image science, and vision. - 2005
English
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.
- Language
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- English
- Open access status
- green
- Identifiers
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- DOI 10.1364/josaa.22.000109
- PMID 15669621
- Persistent URL
- https://sonar.ch/global/documents/239178
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