title: Observed scattering into a dark optical vortex core.
abstract: The dark core of an optical vortex was used to detect on-axis, forward-scattered light from a colloidal solution in the single and multiple scattering regimes. Using no adjustable parameters we obtain good agreement with a concentration-dependent scattering model.
authors.affiliation: Optical Sciences Center, University of Arizona, Tucson, Arizona 85726, USA.
authors.forename: David
authors.initials: D
authors.lastname: Palacios
authors.forename: David
authors.initials: D
authors.lastname: Rozas
authors.forename: Grover A
authors.initials: GA
authors.lastname: Swartzlander