Generation and characterization of focused helical x-ray beams

Lars Loetgering; Margarita Baluktsian; Kahraman Keskinbora; Roarke Horstmeyer; Thomas Wilhein; Gisela Schütz; Kjeld S.E. Eikema; Stefan Witte

doi:10.1126/sciadv.aax8836

Generation and characterization of focused helical x-ray beams

Lars Loetgering^*, Margarita Baluktsian, Kahraman Keskinbora, Roarke Horstmeyer, Thomas Wilhein, Gisela Schütz, Kjeld S.E. Eikema, Stefan Witte

^*Corresponding author for this work

Research output: Contribution to Journal › Article › Academic › peer-review

Abstract

The phenomenon of orbital angular momentum (OAM) affects a variety of important applications in visible optics, including optical tweezers, free-space communication, and 3D localization for fluorescence imaging. The lack of suitable wavefront shaping optics such as spatial light modulators has inhibited the ability to impart OAM on x-ray and electron radiation in a controlled way. Here, we report the experimental observation of helical soft x-ray beams generated by holographically designed diffractive optical elements. We demonstrate that these beams rotate as a function of propagation distance and measure their vorticity and coherent mode structure using ptychography. Our results establish an approach for controlling and shaping of complex focused beams for short wavelength scanning microscopy and OAM-driven applications.

Original language	English
Article number	eaax8836
Pages (from-to)	1-6
Number of pages	6
Journal	Science advances
Volume	6
Issue number	7
DOIs	https://doi.org/10.1126/sciadv.aax8836
Publication status	Published - 14 Feb 2020

Funding

This research was supported by the Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO-HTSM project nr. 13934) and the European Research Council (ERC Starting Grant 637476).

Funders	Funder number
NWO-HTSM	13934
Horizon 2020 Framework Programme	637476
European Research Council
Nederlandse Organisatie voor Wetenschappelijk Onderzoek

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abstract = "The phenomenon of orbital angular momentum (OAM) affects a variety of important applications in visible optics, including optical tweezers, free-space communication, and 3D localization for fluorescence imaging. The lack of suitable wavefront shaping optics such as spatial light modulators has inhibited the ability to impart OAM on x-ray and electron radiation in a controlled way. Here, we report the experimental observation of helical soft x-ray beams generated by holographically designed diffractive optical elements. We demonstrate that these beams rotate as a function of propagation distance and measure their vorticity and coherent mode structure using ptychography. Our results establish an approach for controlling and shaping of complex focused beams for short wavelength scanning microscopy and OAM-driven applications.",

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AU - Loetgering, Lars

AU - Baluktsian, Margarita

AU - Keskinbora, Kahraman

AU - Horstmeyer, Roarke

AU - Wilhein, Thomas

AU - Schütz, Gisela

AU - Eikema, Kjeld S.E.

AU - Witte, Stefan

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Generation and characterization of focused helical x-ray beams

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