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Broadband ptychography using curved wavefront illumination.

Daniel S Penagos Molina, Lars Loetgering, Wilhelm Eschen

|September 15, 2023

Summary

This summary is machine-generated.

Tailoring illumination curvature in ptychography allows for broader spectral bandwidths, enabling higher flux and throughput. This advance relaxes temporal coherence needs, benefiting synchrotron and lab-scale imaging.

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Area of Science:

Coherent imaging
Diffractive imaging techniques

Background:

Ptychography relies on coherent illumination, limiting spectral bandwidth.
Temporal coherence effects typically restrict the usable spectral range in diffraction imaging.

Purpose of the Study:

To investigate the relationship between spectral bandwidth and illumination curvature in ptychography.
To explore methods for utilizing broader spectral bandwidths in ptychography without complex algorithmic changes.

Main Methods:

Analyzing the effect of tailored illumination divergence on spectral bandwidth tolerance.
Investigating how wavefront curvature modifies the effective diffraction geometry.
Examining the impact of curvature on temporal coherence requirements.

Main Results:

Broader spectral bandwidths are tolerated by tailoring illumination divergence.
Strong wavefront curvature shifts the geometry towards a near-field regime, reducing sensitivity to temporal coherence.
Relaxed coherence requirements permit wider spectral bandwidths and larger illumination spots.

Conclusions:

Illumination curvature is a key parameter for managing spectral bandwidth in ptychography.
This work enables the use of pink and broadband beams, increasing flux and throughput.
Findings are applicable to both synchrotron and lab-scale ptychography beamlines.