%0 Journal Article
%A Patommel, Jens
%A Klare, Susanne
%A Hoppe, Robert
%A Ritter, Stephan
%A Samberg, Dirk
%A Wittwer, Felix
%A Jahn, Andreas
%A Richter, Karola
%A Wenzel, Christian
%A Bartha, Johann W.
%A Scholz, Maria
%A Seiboth, Frank
%A Boesenberg, Ulrike
%A Falkenberg, Gerald
%A Schroer, Christian G.
%T Focusing hard x rays beyond the critical angle of total reflection by adiabatically focusing lenses
%J Applied physics letters
%V 110
%N 10
%@ 1077-3118
%C Melville, NY
%I American Inst. of Physics
%M PUBDB-2017-01321
%P 101103 
%D 2017
%Z Verbundprojekte konnten oben nicht angegeben werden: 05K10OD1, 05K13OD4
%X In response to the conjecture that the numerical aperture of x-ray optics is fundamentally limited by the critical angle of total reflection [Bergemann et al., Phys. Rev. Lett. 91, 204801 (2003)], the concept of adiabatically focusing refractive lenses was proposed to overcome this limit [Schroer and Lengeler, Phys. Rev. Lett. 94, 054802 (2005)]. We present an experimental realization of these optics made of silicon and demonstrate that they indeed focus 20 keV x rays to a 18.4 nm focus with a numerical aperture of 1.73(9) × 10<sup>−3</sup> that clearly exceeds the critical angle of total reflection of 1.55 mrad.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000397871800003
%R 10.1063/1.4977882
%U https://bib-pubdb1.desy.de/record/318671