title: Unveiling a truncated optical lattice associated with a triangular aperture using light's orbital angular momentum.
abstract: We show that the orbital angular momentum can be used to unveil lattice properties hidden in diffraction patterns of a simple triangular aperture. Depending on the orbital angular momentum of the incident beam, the far field diffraction pattern reveals a truncated optical lattice associated with the illuminated aperture. This effect can be used to measure the topological charge of light beams.
authors.affiliation: Optics and Materials Group-Optma, Universidade Federal de Alagoas, Caixa Postal 2051, 57061-970, Maceió, AL, Brazil. jmh@optma.org
authors.forename: J M
authors.initials: JM
authors.lastname: Hickmann
authors.forename: E J S
authors.initials: EJ
authors.lastname: Fonseca
authors.forename: W C
authors.initials: WC
authors.lastname: Soares
authors.forename: S
authors.initials: S
authors.lastname: Chávez-Cerda