Broadband ptychography using curved wavefront illumination

Abstract

We examine the interplay between spectral bandwidth and illumination curvature in ptychography. By tailoring the divergence of the illumination, broader spectral bandwidths can be tolerated without requiring algorithmic modifications to the forward model. In particular, a strong wavefront curvature transitions a far-field diffreaction geometry to an effectively near-field one, which is lees affected by temporal coherence effects. The relaxed temporal coherence requirements allow for leveraging wider spectral bandwidths and larger illumination spots. Our findings open up new avenues towards utilizing pink and broadband beams for increased flux and throughput at both synchrotron facilities and lab-scale beamlines.

References in corpus (6)

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• Spatially Resolved Fourier Transform Spectroscopy in the Extreme Ultraviolet
• Super-resolved multispectral lensless microscopy via angle-tilted, wavelength-multiplexed ptychographic modulation
• Broadband holography-assisted coherent imaging -- towards attosecond imaging at the nanoscale
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