Open AccessHigh‐efficiency zone‐plate optics for multi‐keV X‐ray focusing
Author(s) -
Mohacsi Istvan,
Karvinen Petri,
Vartiainen Ismo,
Guzenko Vitaliy A.,
Somogyi Andrea,
Kewish Cameron M.,
Mercere Pascal,
David Christian
Publication year - 2014
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s1600577514003403
Subject(s) - zone plate , fresnel zone , optics , transmission (telecommunications) , binary number , physics , stacking , materials science , x ray optics , photon , fresnel zone antenna , lens (geology) , x ray , diffraction , mathematics , telecommunications , smart antenna , arithmetic , nuclear magnetic resonance , dipole antenna , computer science , antenna (radio) , electrical engineering , engineering
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.