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Hi, @TomaSusi . I have a question regarding the simulation of a 4D-STEM datacube with a defocused probe for further ptychography reconstruction. My code works fine when the defocus is set to 0, but it generates artifacts when defocus is applied. Specifically, I am aiming to simulate a 4D-STEM datacube for defocus values of 500Å, 1000Å, and 15,00Å. However, I am not entirely sure how to correctly design the defocused probe, and I suspect this may be where the issue lies. I have attached my code in a zip file for your reference. Thank you for your time and help. |
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Replies: 2 comments
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Without downloading and open the file, the obvious thing that comes to mind: what is the extent of your potential? A defocused probe is much bigger on the sample than a focused one, and it needs to fit within your simulation cell or you will get finite-size artifacts (probe self-interaction: https://abtem.github.io/doc/user_guide/walkthrough/multislice.html#self-interaction). Might these be happening? |
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@Loewe313 did you verify if your probe fits into the potential? |
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Without downloading and open the file, the obvious thing that comes to mind: what is the extent of your potential? A defocused probe is much bigger on the sample than a focused one, and it needs to fit within your simulation cell or you will get finite-size artifacts (probe self-interaction: https://abtem.github.io/doc/user_guide/walkthrough/multislice.html#self-interaction).
Might these be happening?