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Pablo Villanueva Perez

Senior lecturer

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Circular Unit Cell Gratings for X-ray Dark-Field Imaging

Author

  • Matias Kagias
  • Amogha Pandeshwar
  • Zhentian Wang
  • Pablo Villanueva-Perez
  • Konstantins Jefimovs
  • Marco Stampanoni

Summary, in English

Dark-field imaging has been demonstrated to provide complementary information about the unresolved microstructure of the investigated sample. The usual implementation of a grating interferometer, which can provide access to the dark-field signal, consists of linear gratings limiting the sensitivity to only one direction (perpendicular to the grating lines). Recently, a novel grating design, composed of circular unit cells, was proposed allowing 2D-omnidirectional dark-field sensitivity in a single shot. In this work we present a further optimisation of the proposed grating by changing the arrangement of the unit cells from a Cartesian to a hexagonal grid. We experimentally compare the two designs and demonstrate that the latter has an improved performance.

Publishing year

2017-06-14

Language

English

Publication/Series

Journal of Physics: Conference Series

Volume

849

Document type

Conference paper

Conference name

13th International X-ray Microscopy Conference, XRM 2016

Conference date

2016-08-15 - 2016-08-19

Conference place

Oxford, United Kingdom

Status

Published

ISBN/ISSN/Other

  • ISSN: 1742-6588