High‐efficiency zone‐plate optics for multi‐keV X‐ray focusing. (17th March 2014)

• Record Type: Journal Article
• Authors: Mohacsi, Istvan; Karvinen, Petri; Vartiainen, Ismo; Guzenko, Vitaliy A.; Somogyi, Andrea; Kewish, Cameron M.; Mercere, Pascal; David, Christian
• Is Part Of: Journal of synchrotron radiation. Volume 21:Part 3(2014)
• Page Start: 497
• Page End: 501
• Publication Date: 2014-03-17
• Subjects: Synchrotron radiation -- Periodicals; Free electron lasers -- Periodicals; 539.73505
• DOI: 10.1107/S1600577514003403
• Languages: English
• ISSNs: 0909-0495

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <p>High‐efficiency nanofocusing of hard X‐rays using stacked multilevel Fresnel zone plates with a smallest zone width of 200 nm is demonstrated. The approach is to approximate the ideal parabolic lens profile with two‐, three‐, four‐ and six‐level zone plates. By stacking binary and three‐level zone plates with an additional binary zone plate, the number of levels in the optical transmission function was doubled, resulting in four‐ and six‐level profiles, respectively. Efficiencies up to 53.7% focusing were experimentally obtained with 6.5 keV photons using a compact alignment apparatus based on piezoelectric actuators. The measurements have also been compared with numerical simulations to study the misalignment of the two zone plates.</p> </abstract>