Coherent Tabletop EUV Ptychography of Nanopatterns

Nguyen Xuan Truong, Reza Safaei, Vincent Cardin, Scott M. Lewis, Xiang Li Zhong, François Légaré, Melissa A. Denecke

    Research output: Contribution to journalArticlepeer-review


    Coherent diffraction imaging (CDI) or lensless X-ray microscopy has become of great interest for high spatial resolution imaging of, e.g., nanostructures and biological specimens. There is no optics required in between an object and a detector, because the object can be fully recovered from its far-field diffraction pattern with an iterative phase retrieval algorithm. Hence, in principle, a sub-wavelength spatial resolution could be achieved in a high-numerical aperture configuration. With the advances of ultrafast laser technology, high photon flux tabletop Extreme Ultraviolet (EUV) sources based on the high-order harmonic generation (HHG) have become available to small-scale laboratories. In this study, we report on a newly established high photon flux and highly monochromatic 30 nm HHG beamline. Furthermore, we applied ptychography, a scanning CDI version, to probe a nearly periodic nanopattern with the tabletop EUV source. A wide-field view of about 15 × 15 μm was probed with a 2.5 μm−diameter illumination beam at 30 nm. From a set of hundreds of far-field diffraction patterns recorded for different adjacent positions of the object, both the object and the illumination beams were successfully reconstructed with the extended ptychographical iterative engine. By investigating the phase retrieval transfer function, a diffraction-limited resolution of reconstruction of about 32 nm is obtained.

    Original languageEnglish
    Article number16693
    JournalScientific Reports
    Issue number1
    Early online date12 Nov 2018
    Publication statusPublished - 2018

    Research Beacons, Institutes and Platforms

    • Photon Science Institute
    • Dalton Nuclear Institute


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