Hard-X-ray phase-difference microscopy using a fresnel zone plate and a transmission grating

Area of Science:

• Physics
• Microscopy
• Materials Science

Background:

• X-ray microscopy is crucial for analyzing materials and biological samples.
• Absorption contrast microscopy has limitations in sensitivity, especially for light elements.
• Phase contrast imaging can enhance sensitivity but often requires complex setups.

Purpose of the Study:

• To develop a novel hard x-ray phase imaging microscopy with a simple configuration.
• To demonstrate the capability of mapping x-ray phase shifts quantitatively.
• To assess the impact of the technique on spatial resolution and sensitivity.

Main Methods:

• The microscopy utilizes a standard objective lens and a transmission grating.
• Twin features with opposite phase contrast are generated and analyzed.
• A simple algorithm processes these features to map x-ray phase shifts.
• Spatial resolution is evaluated with and without the grating.

Main Results:

• The microscope successfully generated twin phase-contrast images.
• The presence of the transmission grating did not compromise spatial resolution.
• Sensitivity to light elements was improved by approximately two orders of magnitude compared to absorption contrast.
• Quantitative phase shift mapping was achieved through a straightforward algorithm.

Conclusions:

• The developed hard x-ray phase imaging microscopy offers a simple yet effective method for phase-sensitive imaging.
• The technique significantly enhances sensitivity for light elements without sacrificing spatial resolution.
• This approach provides a facile way to add quantitative phase contrast to existing x-ray microscopes.
• Potential applications span diverse fields including biology and material sciences.