Berlin 2008 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 87: Symposium: Beyond Optical Wavelengths: Time-Resolved Spectroscopy of Surface Dynamics with EUV and XUV Radiation III (Invited Speakers: Christian Spielmann, Matias Bargheer, Philippe Wernet)
O 87.3: Vortrag
Freitag, 29. Februar 2008, 10:30–10:45, HE 101
Toward Imaging Ultrafast Evolution on the Nanoscale — •William Schlotter1,2, Ramon Rick2, Andreas Scherz2, Stefan Eisebitt3, Christian Günther3, Wolfgang Eberhardt3, Olav Hellwig4, Jan Lüning5, and Joachim Stöhr2 — 1Institut für Experimentalphysik Universität Hamburg, Hamburg, Germany — 2Stanford Synchrotron Radiation Laboratory, SLAC, Menlo Park, California, USA. — 3BESSY m.b.H., Berlin, Germany — 4San Jose Research Center, Hitachi Global Storage Technologies, San Jose, California, USA — 5LCP-MR Université Pierre et Marie Curie, Paris, France.
Panoramic full field imaging with nanoscale resolution is demonstrated with soft x-ray Fourier transform holography. To extend the effective field of view, multiple regions of interest distributed about the sample are strategically paired with a holographic reference wave. In this way, images of each local region are simultaneously reconstructed without compromising spatial resolution. Using a nanoscale test structure fabricated by focused ion beam lithography we image four local regions on the sample spanning 180 µm with sub 100 nm spatial resolution.
Applying this holographic method to a cross-beam pump probe geometry, a technique is proposed for capturing multiple ultrafast images of a sample with a single x-ray pulse. In a cross-beam experimental geometry temporal phenomena are captured with respect to spatial position, and thus higher spatial resolution translates to faster dynamics. In this way the high spatial resolution and full field capabilities of holography are exploited to encode temporal information in a hologram, which could be recorded with a single pulse.