title: Modeling highly focused laser beam in optical tweezers with the vector Gaussian beam in the T-matrix method.
abstract: The vector Gaussian beam with high-order corrections is used to describe accurately the laser beam up to numerical aperture 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.
authors: Center for Optics, Photonics, and Lasers, Laval University, Quebec G1K 7P4, Canada.
authors: Paul B
authors: PB
authors: Bareil
authors: Yunlong
authors: Y
authors: Sheng