Fast and efficient hard X-ray projection imaging below 10 nm resolution.

Area of Science:

• Optics and Photonics
• Materials Science
• Nanotechnology

Background:

• Ptychography is a key technique for high-resolution X-ray imaging of noncrystalline materials.
• Imaging resolution is often limited by weak scattering signals and parasitic scattering at high angles.
• Existing methods struggle with background noise, hindering detailed analysis of complex samples.

Purpose of the Study:

• To demonstrate a novel X-ray imaging approach using high numerical aperture (NA) multilayer Laue lenses.
• To overcome resolution limitations imposed by weak scattering and background noise in ptychography.
• To achieve sub-10 nm resolution imaging with improved tolerance to scattering artifacts.

Main Methods:

• Utilized X-ray multilayer Laue lenses with a high NA (0.014) to generate a strong reference beam.
• Employed holographic principles to amplify weak diffraction signals from the sample.
• Recorded projection holograms directly on a pixel-array detector at high effective magnification (>30,000).

Main Results:

• Achieved sub-10 nm imaging resolution at 17.4 keV photon energy.
• Demonstrated high-resolution imaging of a Siemens star test object and nanoporous gold.
• Numerical studies confirmed significant advantages over low-NA far-field ptychography in noisy conditions.

Conclusions:

• High-NA X-ray lenses offer a powerful method for holographic imaging, enhancing weak scattering signals.
• This technique provides a fast, efficient, and facile way to obtain high-resolution transmission phase-contrast images over large fields of view.
• The approach is particularly beneficial for imaging challenging samples with significant background noise.