title: Calculation of optical trapping forces on a dielectric sphere in the ray optics regime produced by a radially polarized laser beam.
abstract: We calculated the optical trapping forces on a microscopic particle in the ray optics regime for the case where a radially polarized laser beam is applied. A higher axial trapping efficiency than for a circularly polarized doughnut beam was predicted due to the large p polarization component. Three-dimensional optical trapping was expected for particles with a larger index of refraction and for objectives with a smaller numerical aperture.
authors.affiliation: Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan. k_hikaru@mail.tagen.tohoku.ac.jp
authors.forename: Hikaru
authors.initials: H
authors.lastname: Kawauchi
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Yonezawa
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Kozawa
authors.forename: Shunichi
authors.initials: S
authors.lastname: Sato