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.
© 2012 Optical Society of America
Fourier Optics and Signal Processing
Original Manuscript: June 22, 2012
Revised Manuscript: August 31, 2012
Manuscript Accepted: September 3, 2012
Published: October 16, 2012
Seong-Woo Cho, Hwi Kim, Joonku Hahn, and Byoungho Lee, "Generation of multiple vortex-cones by direct-phase modulation of annular aperture array," Appl. Opt. 51, 7295-7302 (2012)