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Robust broadband ptychography algorithms for high-harmonic soft X-ray supercontinua.

Benjamin Shearer, Henry Kapteyn, Iona Binnie

|January 29, 2025

Summary

This summary is machine-generated.

We developed PaCMAN, a ptychography algorithm for high-quality imaging with broadband light sources, reducing noise and improving accuracy. This method enables faster, lower-dose imaging for sensitive materials and advanced applications.

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Area of Science:

Coherent diffractive imaging
Computational imaging
Soft X-ray microscopy

Background:

Ptychography is a powerful lensless imaging technique.
Existing methods struggle with broadband illumination and various noise sources.
Monochromatization improves accuracy but is limited for discrete spectra.

Purpose of the Study:

To introduce PaCMAN, a novel ptychography algorithm for high-quality imaging.
To enhance accuracy with broadband sources and noise robustness.
To develop a multi-spectral variant (Ms. PaCMAN) and compare performance.

Main Methods:

Demonstration of PaCMAN with broadband illumination.
Extension of monochromatization techniques for discrete spectra.
Conversion of PaCMAN to a multi-spectral variant (Ms. PaCMAN).
Comparison of speed- and dose-optimized PaCMAN against ePIE.

Main Results:

PaCMAN reconstructs high-quality images with broadband sources, robust to noise.
Ms. PaCMAN outperforms multi-spectral ePIE.
Speed-optimized PaCMAN achieves high quality 4x faster than ePIE.
Dose-optimized PaCMAN requires 1.5-2x less dose than ePIE.

Conclusions:

PaCMAN enables rapid sub-10 nm imaging with soft X-ray supercontinua.
The algorithm advances attosecond coherent diffractive imaging.
PaCMAN significantly reduces radiation dose for imaging sensitive materials.