title: Generation of nondiffracting beams by spiral fields.
abstract: In this paper we demonstrate that spiral fields generate nondiffracting dark beams. A collimated laser beam incident on a compact disc, i.e., a commercial CD, was used as mask for the generation of spiral fields. We study theoretically and experimentally the intensity distribution near the axis of the optical system.
authors.affiliation: Instituto de Física, Facultad de Ingeniería, J. Herrera y Reissig 565, 11300 Montevideo, Uruguay.
authors.forename: José A
authors.initials: JA
authors.lastname: Ferrari
authors.forename: Eugenio
authors.initials: E
authors.lastname: Garbusi
authors.forename: Erna M
authors.initials: EM
authors.lastname: Frins