Dark-field X-ray ptychography

Akihiro Suzuki, Yukio Takahashi

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The dynamic range of X-ray detectors is a key factor limiting both the spatial resolution and sensitivity of X-ray ptychography as well as the coherent flux of incident X-rays. Here, we propose a method for high-resolution and high-sensitivity X-ray ptychography named "dark-field X-ray ptychography", which compresses the dynamic range of intensities of diffraction patterns. In this method, a small reference object is aligned upstream of the sample. The scattered X-rays from the object work as a reference beam for in-line holography. Ptychographic diffraction patterns including the in-line hologram are collected, and then the image of the sample is reconstructed by an iterative phasing method. This method allows us to obscure the low-Q region of the diffraction patterns using a beamstop since the in-line hologram complements structural information in the low-Q region, resulting in the compression of the dynamic range of intensities of diffraction patterns. A numerical study shows that the dynamic range of intensities of diffraction patterns is decreased by about three orders of magnitude.

Original languageEnglish
Pages (from-to)16429-16438
Number of pages10
JournalOptics Express
Volume23
Issue number12
DOIs
Publication statusPublished - 2015 Jun 15
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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