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11 results

  • Accurate and Robust Calibration of the Uniform Affine Transformation Between Scan-Camera Coordinates for Atom-Resolved In-Focus 4D-STEM Datasets

  • Shoucong Ning, Wenhui Xu, Yinhang Ma, Leyi Loh, Timothy J. Pennycook, Wu Zhou, Fucai Zhang, Michel Bosman, Stephen J. Pennycook, Qian He, N. Duane Loh
  • Journal:
    Microscopy and Microanalysis / Volume 28 / Issue 3 / June 2022
    Published online by Cambridge University Press:
    09 March 2022, pp. 622-632
    Print publication:
    June 2022

  • Accurate geometrical calibration between the scan coordinates and the camera coordinates is critical in four-dimensional scanning transmission electron microscopy (4D-STEM) for both quantitative imaging and ptychographic reconstructions. For atomic-resolved, in-focus 4D-STEM datasets, we propose a hybrid method incorporating two sub-routines, namely a J-matrix method and a Fourier method, which can calibrate the uniform affine transformation between the scan-camera coordinates using raw data, without a priori knowledge of the crystal structure of the specimen. The hybrid method is found robust against scan distortions and residual probe aberrations. It is also effective even when defects are present in the specimen, or the specimen becomes relatively thick. We will demonstrate that a successful geometrical calibration with the hybrid method will lead to a more reliable recovery of both the specimen and the electron probe in a ptychographic reconstruction. We will also show that, although the elimination of local scan position errors still requires an iterative approach, the rate of convergence can be improved, and the residual errors can be further reduced if the hybrid method can be firstly applied for initial calibration. The code is made available as a simple-to-use tool to correct affine transformations of the scan-camera coordinates in 4D-STEM experiments.

  • Bonding Pathways of Gold Nanocrystals in Solution

  • Zainul Aabdin, Jingyu Lu, Utkarsh Anand, N. Duane Loh, Utkur Mirsaidov
  • Journal:
    Microscopy and Microanalysis / Volume 21 / Issue S3 / August 2015
    Published online by Cambridge University Press:
    23 September 2015, pp. 269-270
    Print publication:
    August 2015
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