title: Generation of multiple vortex-cones by direct-phase modulation of annular aperture array.
abstract: The generation of multiple vortex cones using an annular aperture array and a spatial light modulator (SLM) is studied. The direct downscale imaging of an SLM on the surface of an annular aperture enables the direct-phase modulation of the annular aperture. It is experimentally demonstrated that the direct-phase modulation of an annular aperture array can control both the topological charge and the horizontal positions of multiple vortex cones simultaneously.
authors.affiliation: National Creative Research Center for Active Plasmonics Application Systems and School of Electrical Engineering, Seoul National University, Seoul, South Korea.
authors.forename: Seong-Woo
authors.initials: SW
authors.lastname: Cho
authors.forename: Hwi
authors.initials: H
authors.lastname: Kim
authors.forename: Joonku
authors.initials: J
authors.lastname: Hahn
authors.forename: Byoungho
authors.initials: B
authors.lastname: Lee