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Dynamic diffraction artefacts in Bragg coherent diffractive imaging.

Wen Hu¹, Xiaojing Huang¹, Hanfei Yan¹

¹National Synchrotron Light Source II, Brookhaven National Laboratory, PO Box 5000, Upton, New York 11973, USA.

Journal of Applied Crystallography

|March 7, 2018

Summary

This summary is machine-generated.

Reconstruction artefacts in Bragg coherent diffractive imaging arise from dynamical diffraction. These effects significantly distort object amplitude and phase, leading to inaccurate shape reconstruction, especially at the dynamical diffraction limit.

Keywords:

Bragg coherent diffractive imaging dynamic diffraction iterative phase reconstruction

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Area of Science:

Materials science
Diffraction imaging
Computational physics

Background:

Bragg coherent diffractive imaging (BCDI) is a powerful technique for nanoscale imaging.
Reconstruction artefacts can limit the accuracy of BCDI.
Dynamical diffraction effects are known to influence X-ray scattering.

Purpose of the Study:

To theoretically investigate reconstruction artefacts in BCDI caused by dynamical diffraction.
To differentiate dynamical diffraction artefacts from those caused by absorption and refraction.
To understand the impact of dynamical diffraction on reconstructed object properties.

Main Methods:

Theoretical modeling of dynamical diffraction effects in BCDI.
Numerical simulations of BCDI reconstruction for hemispherical particles.
Analysis of amplitude and phase distortions in reconstructed objects.

Main Results:

Dynamical diffraction effects cause significant artefacts in both amplitude and phase of reconstructed objects.
Unlike absorption/refraction, these artefacts are difficult to correct post-reconstruction.
At the dynamical diffraction limit, extinction effects lead to incorrect reconstructed shapes.
Simulations reveal the nature, scale, and conditions for negligible dynamical diffraction artefacts.

Conclusions:

Dynamical diffraction is a critical factor to consider for accurate BCDI reconstructions.
The study quantifies the impact of these artefacts, providing guidelines for experimental conditions.
Minimizing dynamical diffraction effects is crucial for reliable nanoscale imaging with BCDI.