Continuous motion scan ptychography: Characterization for increased speed in coherent x-ray imaging

Junjing Deng, Youssef S.G. Nashed, Si Chen, Nicholas W. Phillips, Tom Peterka, Rob Ross, Stefan Vogt, Chris Jacobsen, David J. Vine

Research output: Contribution to journalArticlepeer-review

66 Scopus citations

Abstract

Ptychography is a coherent diffraction imaging (CDI) method for extended objects in which diffraction patterns are acquired sequentially from overlapping coherent illumination spots. The object's complex transmission function can be reconstructed from those diffraction patterns at a spatial resolution limited only by the scattering strength of the object and the detector geometry. Most experiments to date have positioned the illumination spots on the sample using a move-settle-measure sequence in which the move and settle steps can take longer to complete than the measure step. We describe here the use of a continuous "fly-scan" mode for ptychographic data collection in which the sample is moved continuously, so that the experiment resembles one of integrating the diffraction patterns from multiple probe positions. This allows one to use multiple probe mode reconstruction methods to obtain an image of the object and also of the illumination function. We show in simulations, and in x-ray imaging experiments, some of the characteristics of fly-scan ptychography, including a factor of 25 reduction in the data acquisition time. This approach will become increasingly important as brighter x-ray sources are developed, such as diffraction limited storage rings.

Original languageEnglish (US)
Pages (from-to)5438-5451
Number of pages14
JournalOptics Express
Volume23
Issue number5
DOIs
StatePublished - 2015

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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