Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 2: Focus Session: Nanomagnetism in the x-ray spotlight

MA 2.1: Hauptvortrag

Montag, 12. März 2018, 09:30–10:00, H 1012

Advanced X-ray Optics - Zone Plates, Kinoforms and Computer Generated Holograms — •Kahraman Keskinbora, Umut T. Sanli, Margarita Baluktsian, Gül Dogan, Iuliia Bykova, Markus Weigand, and Gisela Schütz — Max Planck Institute for Intelligent Systems, 70569 Stuttgart, Germany

High penetration depths and short wavelengths of X-rays render X-ray microscopy (XRM) a unique tool in a variety of fields, ranging from materials science to medicine for investigating inorganic and biological matter. The success of XRM was historically built on high-resolution diffractive optics. However, limitations in nanofabrication of high aspect ratio diffractive lenses became a crucial bottleneck. Over the last decade, our group has been developing novel X-ray optics by combining atomic layer deposition and focused ion beam micro-machining techniques to attack this bottleneck from several angles. Resolving 20 to 15 nm features was possible using FZPs fabricated via novel ion-beam-lithography and atomic-layer-deposition methods, respectively. Pushing resolutions of these optics below 20 nm while improving efficiencies is a major goal for us. Here, we will discuss fabrication routes that can help achieve this goal. In addition, we present the nanofabrication processes for point focusing kinoform lenses and kinoforms of higher topological charges, shaping of the intensity profile as well as the phase-front of soft X-rays in order to create beams that carry orbital angular momenta. The challenges and solutions in characterization of these complex X-ray phases will also be discussed.