Abstract：
:Bragg coherent X-ray diffraction imaging (BCDI) has emerged as a powerful technique to image the local displacement field and strain in nanocrystals, in three dimensions with nanometric spatial resolution. However, BCDI relies on both dataset collection and phase retrieval algorithms that can induce artefacts in the reconstruction. Phase retrieval algorithms are based on the fast Fourier transform (FFT). We demonstrate how to calculate the displacement field inside a nanocrystal from its reconstructed phase depending on the mathematical convention used for the FFT. We use numerical simulations to quantify the influence of experimentally unavoidable detector deficiencies such as blind areas or limited dynamic range as well as post-processing filtering on the reconstruction. We also propose a criterion for the isosurface determination of the object, based on the histogram of the reconstructed modulus. Finally, we study the capability of the phasing algorithm to quantitatively retrieve the surface strain (i.e., the strain of the surface voxels). This work emphasizes many aspects that have been neglected so far in BCDI, which need to be understood for a quantitative analysis of displacement and strain based on this technique. It concludes with the optimization of experimental parameters to improve throughput and to establish BCDI as a reliable 3D nano-imaging technique.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Carnis J,Gao L,Labat S,Kim YY,Hofmann JP,Leake SJ,Schülli TU,Hensen EJM,Thomas O,Richard MIdoi
10.1038/s41598-019-53774-2subject
Has Abstractpub_date
2019-11-22 00:00:00pages
17357issue
1issn
2045-2322pii
10.1038/s41598-019-53774-2journal_volume
9pub_type
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