title: Optimum generation of annular vortices using phase diffractive optical elements.
abstract: An annular vortex of arbitrary integer topological charge q can be obtained at the Fourier domain of appropriate phase diffractive optical elements. In this context we prove that the diffractive element that generates the vortex with maximum peak intensity has the phase modulation of a propagation-invariant qth order Bessel beam. We discuss additional advantages of this phase element as annular vortex generator.
authors.forename: Victor
authors.initials: V
authors.lastname: Arrizón
authors.forename: Ulises
authors.initials: U
authors.lastname: Ruiz
authors.forename: David
authors.initials: D
authors.lastname: Sánchez-de-la-Llave
authors.forename: Gabriel
authors.initials: G
authors.lastname: Mellado-Villaseñor
authors.forename: Andrey S
authors.initials: AS
authors.lastname: Ostrovsky