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Parabolic gratings enhance the X-ray sensitivity of Talbot interferograms

Zangi, Pouria 1; Ikematsu, Katsumasa; Meyer, Pascal 1; Takano, Hidekazu; Wu, Yanlin; Gutekunst, Josephine 1; Börner, Martin 1,2; Last, Arndt 1,2; Korvink, Jan G. 1; Momose, Atsushi
1 Institut für Mikrostrukturtechnik (IMT), Karlsruher Institut für Technologie (KIT)
2 Karlsruhe Nano Micro Facility (KNMF), Karlsruher Institut für Technologie (KIT)

Abstract:

In grating-based X-ray Talbot interferometry, the wave nature of X-ray radiation is exploited to generate phase contrast images of objects that do not generate sufficient contrast in conventional X-ray imaging relying on X-ray absorption. The phase sensitivity of this interferometric technique is proportional to the interferometer length and inversely proportional to the period of gratings. However, the limited spatial coherency of X-rays limits the maximum interferometer length, and the ability to obtain smaller-period gratings is limited by the manufacturing process. Here, we propose a new optical configuration that employs a combination of a converging parabolic micro-lens array and a diverging micro-lens array, instead of a binary phase grating. Without changing the grating period or the interferometer length, the phase signal is enhanced because the beam deflection by a sample is amplified through the array of converging-diverging micro-lens pairs. We demonstrate that the differential phase signal detected by our proposed set-up is twice that of a Talbot interferometer, using the same binary absorption grating, and with the same overall inter-grating distance.


Verlagsausgabe §
DOI: 10.5445/IR/1000160586
Veröffentlicht am 13.07.2023
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2023
Sprache Englisch
Identifikator ISSN: 2045-2322
KITopen-ID: 1000160586
HGF-Programm 43.35.01 (POF IV, LK 01) Platform for Correlative, In Situ & Operando Charakterizat.
Erschienen in Scientific Reports
Verlag Nature Research
Band 13
Heft 1
Seiten Art.-Nr.: 9624
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 27.06.2023
Nachgewiesen in Web of Science
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