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Lattice Multislice Algorithm for Fast Simulation of Scanning Transmission Electron Microscopy Images
Christian Doberstein, Peter Binev
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We introduce a new approach to the numerical simulation of Scanning Transmission Electron Microscopy images. The Lattice Multislice Algorithm (LMA) takes advantage of the fact that electron waves passing through the specimen have limited bandwidth and therefore can be approximated very well by a low-dimensional linear space spanned by translations of a well-localized function u. Just like in the PRISM algorithm recently published by C. Ophus, we utilize the linearity of the Schr\"odinger equation, but perform the approximations with functions that are well localized in real space instead of Fourier space. This way, we achieve a similar computational speedup as PRISM, but at a much lower memory consumption and reduced numerical error due to avoiding virtual copies of the probe waves interfering with the result. Our approach also facilitates faster recomputations if local changes are made to the specimen such as changing a single atomic column.
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