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Instruments / Technical Area	Publication Details	Published	Actions
I13-1-Coherence	Single-exposure X-ray phase imaging microscopy with a grating interferometer Andreas Wolf , Bernhard Akstaller , Silvia Cipiccia , Silja Flenner , Johannes Hagemann , Veronika Ludwig , Pascal Meyer , Andreas Schropp , Max Schuster , Maria Seifert , Mareike Weule , Thilo Michel , Gisela Anton , Stefan Funk Journal Of Synchrotron Radiation 29 DOI: 10.1107/S160057752200193X Diamond Proposal Number(s): [18540] Open Access Show Abstract ▼ Abstract: The advent of hard X-ray free-electron lasers enables nanoscopic X-ray imaging with sub-picosecond temporal resolution. X-ray grating interferometry offers a phase-sensitive full-field imaging technique where the phase retrieval can be carried out from a single exposure alone. Thus, the method is attractive for imaging applications at X-ray free-electron lasers where intrinsic pulse-to-pulse fluctuations pose a major challenge. In this work, the single-exposure phase imaging capabilities of grating interferometry are characterized by an implementation at the I13-1 beamline of Diamond Light Source (Oxfordshire, UK). For comparison purposes, propagation-based phase contrast imaging was also performed at the same instrument. The characterization is carried out in terms of the quantitativeness and the contrast-to-noise ratio of the phase reconstructions as well as via the achievable spatial resolution. By using a statistical image reconstruction scheme, previous limitations of grating interferometry regarding the spatial resolution can be mitigated as well as the experimental applicability of the technique.	May 2022
B16-Test Beamline	Development of an array of compound refractive lenses for sub-pixel resolution, large field of view, and time-saving in scanning hard X-ray microscopy Talgat Mamyrbayev , Alexander Opolka , Alexey Ershov , Josephine Gutekunst , Pascal Meyer , Katsumasa Ikematsu , Atsushi Momose , Arndt Last Applied Sciences 10 DOI: 10.3390/app10124132 Open Access Show Abstract ▼ Abstract: A two-dimensional array of compound refractive lenses (2D array of CRLs) designed for hard X-ray imaging with a 3.5 mm2 large field of view is presented. The array of CRLs consists of 2D polymer biconcave parabolic 34 × 34 multi-lenses fabricated via deep X-ray lithography. The developed refractive multi-lens array was applied for sub-pixel resolution scanning transmission X–ray microscopy; a raster scan with only 55 × 55 steps provides a 3.5 megapixel image. The optical element was experimentally characterized at the Diamond Light Source at 34 keV. An array of point foci with a 55 µm period and an average size of ca. 2.1 µm × 3.6 µm was achieved. In comparison with the conventional scanning transmission microscopy using one CRL, sub-pixel resolution scanning transmission hard X-ray microscopy enables a large field of view and short scanning time while keeping the high spatial resolution.	Jun 2020

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