Journal Article

FZJ-2021-03080

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Live Processing of Momentum-Resolved STEM Data for First Moment Imaging and Ptychography

Strauch, A. (Corresponding author)FZJ* ; Weber, D. (Corresponding author)FZJ* ; Clausen, A.FZJ* ; Lesnichaia, A. ; Bangun, A.FZJ* ; März, B.FZJ* ; Lyu, F. J. ; Rosenauer, A. ; Dunin-Borkowski, R.FZJ* ; Müller-Caspary, K.FZJ* ; Chen, Q.FZJ*

2021
Cambridge University Press New York, NY

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Please use a persistent id in citations: http://hdl.handle.net/2128/28790  doi:10.1017/S1431927621012423

Abstract: A reformulated implementation of single-sideband ptychography enables analysis and display of live detector data streams in 4D scanning transmission electron microscopy (STEM) using the LiberTEM open-source platform. This is combined with live first moment and further virtual STEM detector analysis. Processing of both real experimental and simulated data shows the characteristics of this method when data are processed progressively, as opposed to the usual offline processing of a complete data set. In particular, the single-sideband method is compared with other techniques such as the enhanced ptychographic engine in order to ascertain its capability for structural imaging at increased specimen thickness. Qualitatively interpretable live results are obtained also if the sample is moved, or magnification is changed during the analysis. This allows live optimization of instrument as well as specimen parameters during the analysis. The methodology is especially expected to improve contrast- and dose-efficient in situ imaging of weakly scattering specimens, where fast live feedback during the experiment is required.

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Contributing Institute(s):

1. Physik Nanoskaliger Systeme (ER-C-1)

Research Program(s):

1. 5351 - Platform for Correlative, In Situ and Operando Characterization (POF4-535) (POF4-535)
2. moreSTEM - Momentum-resolved Scanning Transmission Electron Microscopy (VH-NG-1317) (VH-NG-1317)
3. Ptychography 4.0 - Proposal for a pilot project "Information & Data Science" (ZT-I-0025) (ZT-I-0025)
4. ESTEEM3 - Enabling Science and Technology through European Electron Microscopy (823717) (823717)

Appears in the scientific report 2021

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