Sub-25-nm laboratory x-ray microscopy using a compound Fresnel zone plate von Hofsten, Olov ; Bertilson, Michael ; Reinspach, Julia ; Holmberg, Anders ; Hertz, Hans M. ; Vogt, Ulrich Abstract Publication: Optics Letters Pub Date: September 2009 DOI: 10.1364/OL.34.002631 Bibcode: 2009OptL...34.2631V