Refractive hard x-ray vortex phase plates

Frank Seiboth, Maik Kahnt, Mikhail Lyubomirskiy, Martin Seyrich, Felix Wittwer, Tobias Ullsperger, Stefan Nolte, Darren Batey, Christoph Rau, Christian G. Schroer

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)4622-4625
Number of pages4
JournalOptics Letters
Volume44
Issue number18
DOIs
Publication statusPublished - 2019 Sept 15
Externally publishedYes

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