High‐flux ptychographic imaging using the new 55 µm‐pixel detector `Lambda' based on the Medipix3 readout chip. Issue 6 (14th September 2014)

• Record Type: Journal Article
• Authors: Wilke, R. N.; Wallentin, J.; Osterhoff, M.; Pennicard, D.; Zozulya, A.; Sprung, M.; Salditt, T.
• Is Part Of: Acta crystallographica. Volume 70:Issue 6(2014)
• Page Start: 552
• Page End: 562
• Publication Date: 2014-09-14
• Subjects: Crystallography -- Periodicals; Condensed matter -- Periodicals; 548
• DOI: 10.1107/S2053273314014545
• Languages: English
• ISSNs: 2053-2733

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Suitable detection systems that are capable of recording high photon count rates with single‐photon detection are instrumental for coherent X‐ray imaging. The new single‐photon‐counting pixel detector `Lambda' has been tested in a ptychographic imaging experiment on solar‐cell nanowires using Kirkpatrick–Baez‐focused 13.8 keV X‐rays. Taking advantage of the high count rate of the Lambda and dynamic range expansion by the semi‐transparent central stop, a high‐dynamic‐range diffraction signal covering more than seven orders of magnitude has been recorded, which corresponds to a photon flux density of about 10⁵ photons nm⁻² s⁻¹ or a flux of ∼10¹⁰ photons s⁻¹ on the sample. By comparison with data taken without the semi‐transparent central stop, an increase in resolution by a factor of 3–4 is determined: from about 125 nm to about 38 nm for the nanowire and from about 83 nm to about 21 nm for the illuminating wavefield.</p> </abstract>