title: Quantitative force mapping of an optical vortex trap.
abstract: This paper describes the quantitative force mapping of micron-sized particles held in an optical vortex trap. We present a simple and efficient model, which accounts for the diffraction of the strongly localized optical field of the tightly focused laser beam, the spherical aberration introduced by the dielectric glass-to-water interface, employs the multidipole approximation for force calculations, and is able to reproduce, with quantitative agreement, the experimentally measured force map.
authors.forename: Yiqiong
authors.initials: Y
authors.lastname: Zhao
authors.forename: Graham
authors.initials: G
authors.lastname: Milne
authors.forename: J Scott
authors.initials: JS
authors.lastname: Edgar
authors.forename: Gavin D M
authors.initials: GD
authors.lastname: Jeffries
authors.forename: David
authors.initials: D
authors.lastname: McGloin
authors.forename: Daniel T
authors.initials: DT
authors.lastname: Chiu