Open AccessTwo‐step hard X‐ray focusing combining Fresnel zone plate and single‐bounce ellipsoidal capillary
Author(s) -
Snigirev A.,
Bjeoumikhov A.,
Erko A.,
Snigireva I.,
Grigoriev M.,
Yunkin V.,
Erko M.,
Bjeoumikhova S.
Publication year - 2007
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/s0909049507025174
Subject(s) - capillary action , optics , ellipsoid , beam (structure) , physics , fresnel zone , core (optical fiber) , flux (metallurgy) , zone plate , materials science , diffraction , astronomy , thermodynamics , metallurgy
A two‐step focusing set‐up combining a Fresnel zone plate with an ellipsoidal capillary is presented. It is shown that, in addition to the anticipated gain in flux, the employment of the prefocusing micro‐optic makes optimal use of the elliptical shape of the capillary by almost eliminating aberrations. A small cross section of the prefocused beam allows a tiny fraction of the capillary surface to be selected, thus reducing the influence of slope errors. An X‐ray beam with a 15 keV energy was focused down to a spot size as small as 250 nm, demonstrating the best value that has been achieved up to now for single‐bounce capillaries. The use of an ellipsoidal capillary as a micromirror under off‐axis illumination by microfocusing optics may open up new opportunities in nanofocusing developments.