Abstract

The vector Gaussian beam with high-order corrections is used to describe accurately the laser beam up to numerical aperture $\mathrm{NA}=1.20$ in the optical tweezers for trapping nanoparticles. The beam is then expanded in the T-matrix method into the vector spherical wave function (VSWF) series using the point matching method with a new selection of the matching points. The errors in the beam description and in the VSWF expansion are much lower than those that occur in the paraxial Gaussian beam model.

© 2012 Optical Society of America

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