title: Encoding generalized phase functions on Dammann gratings.
abstract: We extend the Dammann encoding concept to more general phase functions, i.e., to encode a phase pattern so that a number of diffracted orders have the same intensity. We demonstrate a Dammann vortex grating that generates different vortex patterns in the different diffracted orders. We also show a Fresnel lens that creates seven transverse focal spots in each of seven axial planes.
authors.affiliation: Departamento Ciencia de Materiales, Optica y Tecnología Electrónica, Universidad Miguel Hernández, E03202 Elche, Spain. i.moreno@umh.es
authors.forename: Ignacio
authors.initials: I
authors.lastname: Moreno
authors.forename: Jeffrey A
authors.initials: JA
authors.lastname: Davis
authors.forename: Don M
authors.initials: DM
authors.lastname: Cottrell
authors.forename: N
authors.initials: N
authors.lastname: Zhang
authors.forename: X-C
authors.initials: XC
authors.lastname: Yuan