title: Variable-radius focused optical vortex with suppressed sidelobes.
abstract: We propose a design for a phase mask for generating an optical vortex with suppressed sidelobes in the focal plane where the radius of the intensity ring is variable. A radial modulation added to conventional phase mask exp(iltheta) projects the light diffracted from different annular zones into a single intensity ring in the focal plane.
authors: Photonics Research Centre, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore.
authors: J
authors: J
authors: Lin
authors: X-C
authors: XC
authors: Yuan
authors: S H
authors: SH
authors: Tao
authors: R E
authors: RE
authors: Burge