Resolving 500 nm axial separation by multi-slice X-ray ptychography

Area of Science:

• X-ray imaging
• Nanotechnology
• Materials science

Background:

• Achieving nanoscale resolution in thick samples is challenging due to depth-of-field limitations.
• Traditional imaging methods struggle to resolve structures within extended specimens.

Purpose of the Study:

• To demonstrate multi-slice X-ray ptychography for high-resolution 3D imaging of thick samples.
• To resolve closely spaced nanostructures along the axial direction.

Main Methods:

• Modeling thick samples as stacked thin slices.
• Accounting for wavefront propagation effects within the specimen.
• Simultaneous measurement of fluorescence maps for multi-modality imaging.

Main Results:

• Experimental resolution of two nanostructure layers separated by 500 nm axially.
• Achieved sub-10 nm resolution on one layer and sub-20 nm on another.
• Demonstrated enhanced axial sectioning using correlative multi-modality signals.

Conclusions:

• Multi-slice X-ray ptychography enables high-resolution 3D imaging of thick specimens.
• The method shows significant potential for investigating extended dimensions in materials.
• Multi-modality measurements improve the decoupling of features across different slices.