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  • 2013-2022
  • Netherlands Organisation for Scientific Research (NWO)
  • Towards inline 2D surface topometry by lensless imaging

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  • Other research product . 2017
    Open Access Czech
    Authors: 
    Kocour, Matěj;
    Publisher: Západočeská univerzita v Plzni
    Country: Czech Republic
    Project: NWO | Towards inline 2D surface... (2300188781)

    Práce se věnuje vzniku, průběhu a důsledkům čtyř posloupných válek v Africe na Zlatonosném pobřeží. Ve válkách se zajímavě kloubily zájmy afrických království a obchodní rivalita evropských států v regionu, jmenovitě Anglie a Spojených provincií. Práce války popisuje hlavně z evropské perspektivy, a zároveň je v jejím rámci i celkově popsaná koexistence Evropanů, žijících v pevnostech na pobřeží Guinejského zálivu a domorodých Afričanů, způsob, jakým se Evropané v Africe angažovali a fungování místní politiky domorodých států a evropských obchodních společností. Obhájeno The thesis follows the origin, the course and the consequences of four successive wars in Africa on the Gold Coast. In these wars, there an interesting intertwining of local African polities and trading rivalry of European states in the region, namely England and United provinces. The thesis describes the wars mainly from European perspective, and within its frameworks, it also describes the general coexistence of Europeans, living on the trading forts in Guinea bay and native Africans, the way how Europeans engaged themselves in Africa and the way local politics and politics of the European trading companies worked.

  • Open Access English
    Authors: 
    Lars Loetgering; Margarita Baluktsian; Kahraman Keskinbora; Roarke Horstmeyer; Thomas Wilhein; Gisela Schütz; Kjeld S. E. Eikema; Stefan Witte;
    Publisher: American Association for the Advancement of Science
    Country: Netherlands
    Project: NWO | Towards inline 2D surface... (2300188781), EC | Lensless (637476)

    The phenomenon of orbital angular momentum (OAM) affects a variety of important applications in visible optics, including optical tweezers, free-space communication, and 3D localization for fluorescence imaging. The lack of suitable wavefront shaping optics such as spatial light modulators has inhibited the ability to impart OAM on x-ray and electron radiation in a controlled way. Here, we report the experimental observation of helical soft x-ray beams generated by holographically designed diffractive optical elements. We demonstrate that these beams rotate as a function of propagation distance and measure their vorticity and coherent mode structure using ptychography. Our results establish an approach for controlling and shaping of complex focused beams for short wavelength scanning microscopy and OAM-driven applications. Binary zone plates can be engineered to generate helical x-ray beams with large orbital angular momentum.

  • Open Access English
    Authors: 
    Ruslan Röhrich; A. Femius Koenderink; Stefan Witte; Lars Loetgering;
    Country: Netherlands
    Project: NWO | Towards inline 2D surface... (2300188781), EC | Lensless (637476)

    Abstract Flexible and fast control of the phase and amplitude of coherent light, enabled by digital micromirror devices (DMDs) and spatial light modulators, has been a driving force for recent advances in optical tweezers, nonlinear microscopy, and wavefront shaping. In contrast, engineering spatially partially coherent light remains widely elusive due to the lack of tools enabling a joint analysis and control sequence. Here, we report an approach to coherence engineering that combines a quasi-monochromatic, thermal source and a DMD together with a ptychographic scanning microscope. The reported method opens up new routes to low-cost coherence control, with applications in micromanipulation, nanophotonics, and quantitative phase contrast imaging.

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