Digital in-line soft x-ray holography with element contrast

Area of Science:

• X-ray microscopy
• Materials science
• Cell biology

Background:

• Distinguishing materials at the nanoscale requires advanced imaging techniques.
• X-ray absorption properties vary significantly between elements, especially near absorption edges.

Purpose of the Study:

• To demonstrate the capability of digital in-line soft x-ray holography (DIXH) for element-specific imaging.
• To differentiate materials based on their x-ray absorption characteristics.
• To visualize and analyze cellular structures, specifically the cell nucleus.

Main Methods:

• Utilized digital in-line soft x-ray holography (DIXH) near the carbon K-absorption edge.
• Imaged immobilized polystyrene and iron oxide particles.
• Correlated DIXH images with scanning electron microscopy (SEM) data.
• Acquired DIXH images of a cell nucleus for comparison.

Main Results:

• Successfully distinguished polystyrene and iron oxide particles using DIXH based on differential x-ray absorption.
• Obtained element-specific contrast in DIXH images.
• Visualized contrast differences within the cell nucleus, comparing DIXH with optical microscopy.

Conclusions:

• DIXH is effective for element-specific material differentiation.
• The technique offers valuable insights into the composition and structure of microscopic samples, including biological specimens like cell nuclei.