Simultaneous high-speed and low-dose 4-D STEM using compressive sensing techniques

Robinson, A. W., Moshtaghpour, A., Wells, J., Nicholls, D., Chi, M., MacLaren, I. , Kirkland, A. I. and Browning, N. D. (2023) Simultaneous high-speed and low-dose 4-D STEM using compressive sensing techniques. arXiv, (doi: 10.48550/arXiv.2309.14055)

Abstract

Here we show that compressive sensing allow 4-dimensional (4-D) STEM data to be obtained and accurately reconstructed with both high-speed and low fluence. The methodology needed to achieve these results compared to conventional 4-D approaches requires only that a random subset of probe locations is acquired from the typical regular scanning grid, which immediately generates both higher speed and the lower fluence experimentally. We also consider downsampling of the detector, showing that oversampling is inherent within convergent beam electron diffraction (CBED) patterns, and that detector downsampling does not reduce precision but allows faster experimental data acquisition. Analysis of an experimental atomic resolution yttrium silicide data-set shows that it is possible to recover over 25dB peak signal-to-noise in the recovered phase using 0.3% of the total data.

• Item Type: Articles
• Additional Information: This work was performed at the Albert Crewe Centre (ACC) for Electron Microscopy, a shared research facility (SRF) fully supported by the University of Liverpool. This work was also funded by the EPSRC Centre for Doctoral Training in Distributed Algorithms (EP/S023445/1), Sivananthan Labs, and the Rosalind Franklin Institute. M.C. would like to acknowledge the support by the US DOE Office of Science Early Career project FWP# ERKCZ55 and the Center for Nanophase Materials Sciences (CNMS), a US DOE Office of Science User Facility. Initial experiments were carried out using MagTEM, a JEOL ARM200F STEM in the Kelvin Nanocharacterisation Centre , which was installed with support from the University of Glasgow and the Scottish Universities Physics Alliance.
• Status: Published
• Refereed: No
• Glasgow Author(s) Enlighten ID: MacLaren, Dr Ian
• Authors: Robinson, A. W., Moshtaghpour, A., Wells, J., Nicholls, D., Chi, M., MacLaren, I., Kirkland, A. I., and Browning, N. D.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: arXiv
• Copyright Holders: Copyright © 2023 The Authors
• First Published: First published in arXiv 2023

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