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Dual energy X-ray beam ptycho-fluorescence imaging

DOI: 10.1107/S1600577521008675 DOI Help

Authors: Silvia Cipiccia (University College London; Diamond Light Source) , Francesco Brun (University of Trieste) , Vittorio Di Trapani (University of Trieste) , Christoph Rau (Diamond Light Source) , Darren J. Batey (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Synchrotron Radiation , VOL 28

State: Published (Approved)
Published: November 2021
Diamond Proposal Number(s): 21767

Open Access Open Access

Abstract: X-ray ptychography and X-ray fluorescence are complementary nanoscale imaging techniques, providing structural and elemental information, respectively. Both methods acquire data by scanning a localized beam across the sample. X-ray ptychography processes the transmission signal of a coherent illumination interacting with the sample, to produce images with a resolution finer than the illumination spot and step size. By enlarging both the spot and the step size, the technique can cover extended regions efficiently. X-ray fluorescence records the emitted spectra as the sample is scanned through the localized beam and its spatial resolution is limited by the spot and step size. The requisites for fast ptychography and high-resolution fluorescence appear incompatible. Here, a novel scheme that mitigates the difference in requirements is proposed. The method makes use of two probes of different sizes at the sample, generated by using two different energies for the probes and chromatic focusing optics. The different probe sizes allow to reduce the number of acquisition steps for the joint fluorescence–ptychography scan compared with a standard single beam scan, while imaging the same field of view. The new method is demonstrated experimentally using two undulator harmonics, a Fresnel zone plate and an energy discriminating photon counting detector.

Journal Keywords: X-ray fluorescence; X-ray ptychography; pink beam.

Subject Areas: Technique Development, Physics

Instruments: I13-1-Coherence

Added On: 06/10/2021 11:31


Discipline Tags:

Physics Technique Development - Physics

Technical Tags:

Imaging Coherent Diffraction Imaging (CDI) Ptychography