Exact radiation trapping force calculation based on vectorial diffraction theory


Ganic, Djenan; Gan, Xiaosong; Gu, Min

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There has been an interest to understand the trapping performance produced by a laser beam with a complex wavefront structure because the current methods for calculating trapping force ignore the effect of diffraction by a vectorial electromagnetic wave. In this letter, we present a method for determining radiation trapping force on a micro-particle, based on the vectorial diffraction theory and the Maxwell stress tensor approach. This exact method enables one to deal with not only complex apodization, phase, and polarization structures of trapping laser beams but also the effect of spherical aberration present in the trapping system.

Publication year


Publication type

Journal article


Optics Express, Vol. 12, no. 12 (2004), pp. 2670-2675




Optical Society of America


Copyright © 2004 Optical Society of America. The published version is reproduced in accordance with the copyright policy of the publisher. This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/abstract.cfm?URI=oe-12-12-2670. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.