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Refractive hard x-ray vortex phase plates

: Seiboth, F.; Kahnt, M.; Lyubomirskiy, M.; Seyrich, M.; Wittwer, F.; Ullsperger, T.; Nolte, S.; Batey, D.; Rau, C.; Schroer, C.G.


Optics Letters 44 (2019), Nr.18, S.4622-4625
ISSN: 0146-9592
Fraunhofer IOF ()

In this Letter, we report on the creation of hard x-ray beams carrying orbital angular momentum of topological charge −ℏ and −3ℏ at a photon energy of 8.2 keV via spiral phase plates made out of fused silica by ultrashort-pulsed laser ablation. The phase plates feature a smooth phase ramp with a 0.5 μm nominal step height and a surface roughness of 0.5 μm. The measured vortex beams show submicrometer-sized donut rings and agree well with numerical modeling. Fused silica phase plates are potentially suited to manipulate the electromagnetic field in highly intense x-ray beams at x-ray free-electron laser sources.