Dual energy X-ray beam ptycho-fluorescence imaging

Area of Science:

• Nanoscale imaging
• X-ray microscopy
• Materials characterization

Background:

• X-ray ptychography and X-ray fluorescence are complementary nanoscale imaging techniques.
• Standard methods require incompatible parameters for speed and resolution.
• Existing techniques face limitations in simultaneously acquiring high-resolution structural and elemental data.

Purpose of the Study:

• To develop a novel scheme for joint X-ray ptychography and fluorescence imaging.
• To overcome the incompatibility of requirements for fast ptychography and high-resolution fluorescence.
• To enable efficient nanoscale structural and elemental mapping.

Main Methods:

• Utilizing two X-ray probes of different sizes generated at different energies.
• Employing chromatic focusing optics for probe generation.
• Performing a joint fluorescence-ptychography scan with reduced acquisition steps.
• Experimental demonstration using undulator harmonics, a Fresnel zone plate, and a photon counting detector.

Main Results:

• Demonstrated a novel dual-probe scheme for combined nanoscale imaging.
• Successfully mitigated the differing requirements of ptychography and fluorescence.
• Reduced the number of acquisition steps for imaging the same field of view.
• Achieved simultaneous structural and elemental information at the nanoscale.

Conclusions:

• The proposed dual-probe method offers an efficient approach for combined nanoscale imaging.
• This technique overcomes previous limitations in simultaneous structural and elemental analysis.
• It paves the way for advanced materials characterization and nanoscale investigations.