Full-field microimaging with 8 keV X-rays achieves a spatial resolutions better than 20 nm

Area of Science:

• X-ray optics
• Nanofabrication
• Advanced imaging techniques

Background:

• Fresnel zone plates are crucial diffractive optical elements for X-ray microscopy.
• Improving spatial resolution and efficiency of zone plates is an ongoing challenge.
• High-aspect-ratio fabrication is key for advanced diffractive optics.

Purpose of the Study:

• To develop and characterize high-performance Fresnel zone plates for X-ray microscopy.
• To achieve sub-20 nm spatial resolution with high efficiency.
• To demonstrate Zernike phase contrast imaging using these advanced zone plates.

Main Methods:

• Fabrication of Fresnel zone plates using combined electron beam lithography and electrodeposition.
• Characterization of zone plate performance using 8 keV photons in a full field transmission setup.
• Implementation and testing of Zernike phase contrast imaging.

Main Results:

• Achieved spatial resolution better than 20 nm.
• Obtained an efficiency of 1.5% with 8 keV photons.
• Successfully realized Zernike phase contrast without compromising resolution.

Conclusions:

• The fabricated Fresnel zone plates represent a significant advancement in X-ray microscopy optics.
• The combined lithography and electrodeposition technique enables high-aspect-ratio fabrication for improved performance.
• These results pave the way for enhanced nanoscale imaging capabilities.