Refractive hard x-ray vortex phase plates.
Opt Lett
; 44(18): 4622-4625, 2019 Sep 15.
Article
em En
| MEDLINE
| ID: mdl-31517948
ABSTRACT
In this Letter, we report on the creation of hard x-ray beams carrying orbital angular momentum of topological charge -â and -3â 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.
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01-internacional
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MEDLINE
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En
Ano de publicação:
2019
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Article