Coherent diffractive imaging: towards achieving atomic resolution

Area of Science:

• Coherent diffractive imaging
• Materials science
• X-ray physics

Background:

• Next-generation X-ray sources provide highly brilliant beams for nanoscale imaging.
• Coherent diffractive imaging (CDI) is a powerful technique for high-resolution imaging.
• Understanding the relationship between dose, resolution, and material structure is crucial for advancing CDI.

Purpose of the Study:

• To develop a general formalism for predicting spatial resolution in CDI based on diffracted intensities.
• To investigate the influence of atomic-scale structure on the coherent dose required for achieving atomic resolution.
• To explore dose reduction strategies for crystalline materials.

Main Methods:

• Development of a theoretical framework to predict achievable spatial resolution from diffracted intensities.
• Analysis of dose requirements for various material structures, including disordered, amorphous, and crystalline materials.
• Modeling dose reduction in crystalline materials based on unit-cell dimensions and structure factors.

Main Results:

• A formalism is presented to predict spatial resolution in CDI using only diffracted intensities.
• The coherent dose for atomic resolution is highly dependent on atomic-scale structure.
• Disordered/amorphous materials require significantly less dose (approx. three orders of magnitude) than uniform density materials.
• Predicted dose reduction for crystalline materials at specific resolutions, linked to their structural properties.

Conclusions:

• The achievable resolution in CDI is predictable from diffracted intensities.
• Material structure is a critical factor in determining the coherent dose needed for atomic resolution imaging.
• The findings provide a pathway for optimizing imaging strategies and dose management in advanced X-ray microscopy.