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Phase modulation due to crystal diffraction by ptychographic imaging

Civita, M; Diaz, A; Bean, RJ; Shabalin, AG; Gorobtsov, OY; Vartanyants, IA; Robinson, IK; (2018) Phase modulation due to crystal diffraction by ptychographic imaging. Physical Review B , 97 (10) , Article 104101. 10.1103/PhysRevB.97.104101. Green open access

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Abstract

Solving the phase problem in x-ray crystallography has occupied a considerable scientific effort in the 20th century and led to great advances in structural science. Here we use x-ray ptychography to demonstrate an interference method which measures the phase of the beam transmitted through a crystal, relative to the incoming beam, when diffraction takes place. The observed phase change of the direct beam through a small gold crystal is found to agree with both a quasikinematical model and full dynamical theories of diffraction. Our discovery of a diffraction contrast mechanism will enhance the interpretation of data obtained from crystalline samples using the ptychography method, which provides some of the most accurate x-ray phase-contrast images.

Type: Article
Title: Phase modulation due to crystal diffraction by ptychographic imaging
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevB.97.104101
Publisher version: https://doi.org/10.1103/PhysRevB.97.104101
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Keywords: Science & Technology, Physical Sciences, Physics, Condensed Matter, Physics, X-RAY-DIFFRACTION, DYNAMICAL DIFFRACTION, MICROSCOPY, TOMOGRAPHY, TRANSMISSION, REFLECTION, ALGORITHMS
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/10045801
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