Clark, Laura orcid.org/0000-0001-9471-2743, Martinez, Gerardo T., O’Leary, Colum M. et al. (5 more authors) (2023) The Effect of Dynamical Scattering on Single-plane Phase Retrieval in Electron Ptychography. Microscopy and Microanalysis. pp. 384-394. ISSN 1431-9276
Abstract
Segmented and pixelated detectors on scanning transmission electron microscopes enable the complex specimen transmission function to be reconstructed. Imaging the transmission function is key to interpreting the electric and magnetic properties of the specimen, and as such four-dimensional scanning transmission electron microscopy (4D-STEM) imaging techniques are crucial for our understanding of functional materials. Many of the algorithms used in the reconstruction of the transmission function rely on the multiplicative approximation and the (weak) phase object approximation, which are not valid for many materials, particularly at high resolution. Herein, we study the breakdown of simple phase imaging in thicker samples. We demonstrate the behavior of integrated center of mass imaging, single-side band ptychography, and Wigner distribution deconvolution over a thickness series of simulated GaN 4D-STEM datasets. We further give guidance as to the optimal focal conditions for obtaining a more interpretable dataset using these algorithms.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | Funding Information: This research was partly supported under the Discovery Projects funding scheme of the Australian Research Council (Project No. DP160102338). This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 891504. Support is gratefully acknowledged from the EPSRC (EP/K040375/1 “South of England Analytical Electron Microscope”), the Henry Royce Institute for Advanced Materials (EP/R00661X/1, EP/S019367/1, and EP/R010145/1) and grant number EP/M010708/1. Financial support was also received from the EU H2020 Grant No. 823717 ESTEEM3. Publisher Copyright: © The Author(s) 2022. |
Keywords: | 4D-STEM,phase retrieval,ptychography,scanning transmission electron microscopy |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Biology (York) |
Depositing User: | Pure (York) |
Date Deposited: | 24 Nov 2023 10:50 |
Last Modified: | 16 Dec 2024 00:18 |
Published Version: | https://doi.org/10.1093/micmic/ozac022 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1093/micmic/ozac022 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:205919 |
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Filename: ozac022.pdf
Description: The Effect of Dynamical Scattering on Single-plane Phase Retrieval in Electron Ptychography
Licence: CC-BY-NC 2.5