Observation of an x-ray vortex
AG Peele, PJ McMahon, D Paterson, CQ Tran, AP Mancuso, KA Nugent, JP Hayes, E Harvey, B Lai, I McNulty
OPTICS LETTERS | OPTICAL SOC AMER | Published : 2002
Phase singularities are a ubiquitous feature of waves of all forms and represent a fundamental aspect of wave topology. An optical vortex phase singularity occurs when there is a spiral phase ramp about a point phase singularity. We report an experimental observation of an optical vortex in a field consisting of 9-keV x-ray photons. The vortex is created with an x-ray optical structure that imparts a spiral phase distribution to the incident wave field and is observed by use of diffraction about a wire to create a division-of-wave-front interferometer.