期刊
APPLIED PHYSICS LETTERS
卷 110, 期 10, 页码 -出版社
AIP Publishing
DOI: 10.1063/1.4977882
关键词
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资金
- German Ministry of Education and Research (BMBF) [05K10OD1, 05K13OD4]
- Impuls- und Vernetzungsfonds (IVF) of the Helmholtz Association of German Research Centres [VH-VI-403]
- PETRA III was granted within the user program of DESY [P06]
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) x 10(-3) that clearly exceeds the critical angle of total reflection of 1.55 mrad. Published by AIP Publishing.
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