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Reconstruction of the near-field distribution in an X-ray waveguide array

Iterative phase retrieval has been used to reconstruct the near-field distribution behind tailored X-ray waveguide arrays, by inversion of the measured far-field pattern recorded under fully coherent conditions. It is thereby shown that multi-waveguide interference can be exploited to control the ne...

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Autores principales: Zhong, Qi, Melchior, Lars, Peng, Jichang, Huang, Qiushi, Wang, Zhanshan, Salditt, Tim
Formato: Online Artículo Texto
Lenguaje:English
Publicado: International Union of Crystallography 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5458589/
https://www.ncbi.nlm.nih.gov/pubmed/28656035
http://dx.doi.org/10.1107/S1600576717004630
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author Zhong, Qi
Melchior, Lars
Peng, Jichang
Huang, Qiushi
Wang, Zhanshan
Salditt, Tim
author_facet Zhong, Qi
Melchior, Lars
Peng, Jichang
Huang, Qiushi
Wang, Zhanshan
Salditt, Tim
author_sort Zhong, Qi
collection PubMed
description Iterative phase retrieval has been used to reconstruct the near-field distribution behind tailored X-ray waveguide arrays, by inversion of the measured far-field pattern recorded under fully coherent conditions. It is thereby shown that multi-waveguide interference can be exploited to control the near-field distribution behind the waveguide exit. This can, for example, serve to create a secondary quasi-focal spot outside the waveguide structure. For this proof of concept, an array of seven planar Ni/C waveguides are used, with precisely varied guiding layer thickness and cladding layer thickness, as fabricated by high-precision magnetron sputtering systems. The controlled thickness variations in the range of 0.2 nm results in a desired phase shift of the different waveguide beams. Two kinds of samples, a one-dimensional waveguide array and periodic waveguide multilayers, were fabricated, each consisting of seven C layers as guiding layers and eight Ni layers as cladding layers. These are shown to yield distinctly different near-field patterns.
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spelling pubmed-54585892017-06-27 Reconstruction of the near-field distribution in an X-ray waveguide array Zhong, Qi Melchior, Lars Peng, Jichang Huang, Qiushi Wang, Zhanshan Salditt, Tim J Appl Crystallogr Research Papers Iterative phase retrieval has been used to reconstruct the near-field distribution behind tailored X-ray waveguide arrays, by inversion of the measured far-field pattern recorded under fully coherent conditions. It is thereby shown that multi-waveguide interference can be exploited to control the near-field distribution behind the waveguide exit. This can, for example, serve to create a secondary quasi-focal spot outside the waveguide structure. For this proof of concept, an array of seven planar Ni/C waveguides are used, with precisely varied guiding layer thickness and cladding layer thickness, as fabricated by high-precision magnetron sputtering systems. The controlled thickness variations in the range of 0.2 nm results in a desired phase shift of the different waveguide beams. Two kinds of samples, a one-dimensional waveguide array and periodic waveguide multilayers, were fabricated, each consisting of seven C layers as guiding layers and eight Ni layers as cladding layers. These are shown to yield distinctly different near-field patterns. International Union of Crystallography 2017-05-16 /pmc/articles/PMC5458589/ /pubmed/28656035 http://dx.doi.org/10.1107/S1600576717004630 Text en © Qi Zhong et al. 2017 http://creativecommons.org/licenses/by/2.0/uk/ This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.http://creativecommons.org/licenses/by/2.0/uk/
spellingShingle Research Papers
Zhong, Qi
Melchior, Lars
Peng, Jichang
Huang, Qiushi
Wang, Zhanshan
Salditt, Tim
Reconstruction of the near-field distribution in an X-ray waveguide array
title Reconstruction of the near-field distribution in an X-ray waveguide array
title_full Reconstruction of the near-field distribution in an X-ray waveguide array
title_fullStr Reconstruction of the near-field distribution in an X-ray waveguide array
title_full_unstemmed Reconstruction of the near-field distribution in an X-ray waveguide array
title_short Reconstruction of the near-field distribution in an X-ray waveguide array
title_sort reconstruction of the near-field distribution in an x-ray waveguide array
topic Research Papers
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5458589/
https://www.ncbi.nlm.nih.gov/pubmed/28656035
http://dx.doi.org/10.1107/S1600576717004630
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