|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Characterization of Materials through High Resolution Imaging
||Improve Phase Retrieval Performance in Bragg CDI by Simultaneous Reconstruction of Multiple Diffraction Peaks
||Yuan Gao, Garth J. Williams
|On-Site Speaker (Planned)
Bragg coherent diffractive imaging (BCDI) is a non-invasive microscopy technique that can visualize the morphology and internal lattice deviations of crystals with nanoscale spatial resolution and picometer deformation sensitivity. While BCDI has been successfully applied in various studies of materials, it is less successful for highly strained crystals. Specifically, it is difficult to correctly reconstruct the electron density of a highly strained object using the conventional phase retrieval algorithms. Although various algorithms have been developed to overcome this challenge, most of them require a priori knowledge that is not always available in practice. Here we report on modified error reduction and hybrid input-output algorithms that can invert diffraction patterns from multiple Bragg peaks simultaneously. Due to the large degree of data redundancy, the new method is able to reliably reconstruct highly strained objects in a single run without a priori knowledge of the sample.