title: Analytic calculation of vortex diffraction by a triangular aperture.
abstract: We present an analytic calculation of the diffraction of a vortex beam by a triangular aperture. This calculation is used to study the diffraction of multimode vortex beams and off-axis vortex beams. Implications of these results for the effectiveness of diffraction as a vortex detection method are discussed.
authors.forename: Charlotte
authors.initials: C
authors.lastname: Stahl
authors.forename: Greg
authors.initials: G
authors.lastname: Gbur