title: Observation of the transfer of the local angular momentum density of a multiringed light beam to an optically trapped particle.
abstract: We observe the spinning and orbital motion of a microscopic particle trapped within a multiringed light beam that arises from the transfer of the spin and orbital components of the light's angular momentum. The two rotation rates are measured as a function of the distance between the particle and the axis of the trapping beam. The radial dependence of these observations is found to be in close agreement with the accepted theory.
authors.affiliation: School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, United Kingdom.
authors.forename: V
authors.initials: V
authors.lastname: Garcés-Chávez
authors.forename: D
authors.initials: D
authors.lastname: McGloin
authors.forename: M J
authors.initials: MJ
authors.lastname: Padgett
authors.forename: W
authors.initials: W
authors.lastname: Dultz
authors.forename: H
authors.initials: H
authors.lastname: Schmitzer
authors.forename: K
authors.initials: K
authors.lastname: Dholakia