Phys. Rev. Lett. 94, 054802 (2005) [4 pages]Focusing Hard X Rays to Nanometer Dimensions by Adiabatically Focusing LensesReceived 13 October 2004; published 10 February 2005 We address the question of what is the smallest spot size that hard x rays can be focused to using refractive optics. A thick refractive x-ray lens is considered, whose aperture is gradually (adiabatically) adapted to the size of the beam as it converges to the focus. These adiabatically focusing lenses are shown to have a relatively large numerical aperture, focusing hard x rays down to a lateral size of 2 nm (FWHM), well below the theoretical limit for focusing with waveguides [ C. Bergemann et al. Phys. Rev. Lett. 91 204801 (2003)]. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.054802
DOI:
10.1103/PhysRevLett.94.054802
PACS:
41.50.+h, 07.85.Qe
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