Mixed-state electron ptychography enables sub-angstrom resolution imaging with picometer precision at low dose.

Nature Communications
Zhen ChenDavid A Muller

Abstract

Both high resolution and high precision are required to quantitatively determine the atomic structure of complex nanostructured materials. However, for conventional imaging methods in scanning transmission electron microscopy (STEM), atomic resolution with picometer precision cannot usually be achieved for weakly-scattering samples or radiation-sensitive materials, such as 2D materials. Here, we demonstrate low-dose, sub-angstrom resolution imaging with picometer precision using mixed-state electron ptychography. We show that correctly accounting for the partial coherence of the electron beam is a prerequisite for high-quality structural reconstructions due to the intrinsic partial coherence of the electron beam. The mixed-state reconstruction gains importance especially when simultaneously pursuing high resolution, high precision and large field-of-view imaging. Compared with conventional atomic-resolution STEM imaging techniques, the mixed-state ptychographic approach simultaneously provides a four-times-faster acquisition, with double the information limit at the same dose, or up to a fifty-fold reduction in dose at the same resolution.

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Citations

Mar 29, 2021·Ultramicroscopy·Jacob MadsenToma Susi
Aug 21, 2021·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·Jingyue Jimmy Liu
Sep 4, 2021·Journal of Synchrotron Radiation·Yue ZhangRaimond B G Ravelli

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Methods Mentioned

BETA
imaging techniques
transmission electron microscopy
imaging technique
electron ptychography
electron
X-ray
scanning diffraction

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