Dresden 2011 – scientific programme

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O: Fachverband Oberflächenphysik

O 35: Poster Session I (Scanning probe methods)

O 35.5: Poster

Tuesday, March 15, 2011, 18:30–22:00, P3

Design of a low-temperature scanning tunneling microscope with integrated lenses for in-situ optical access — •Jens Kügel, Paolo Sessi, and Matthias Bode — Institute of Experimental Physics II, University Würzburg, Am Hubland, 97074 Würzburg

While Scanning Tunneling Microscopy (STM) is a well-estabilished technique to gain information on surfaces topography and density of states on the atomic scale, its time resolution ist still rather limited. Under open loop conditions, values down to the nanoseconds regime have been recently reported [1]. This limitation can be overcome by laser spectroscopy which offers a time resolution down to a few attoseconds [2]. Here we present a low-temperature STM design able to combine these two experimental techniques. Besides standard STM features such as tip coarse movement and sample-nanopositioning, it includes lense holders for focused back and front side laser illumination. Potential measurement modes aimed, e.g., for the spatio-temporal investigation of excited molecular states, will be discussed.

[1] S. Loth et al., Science 329, 5999 (2010)

[2] M. Schultze et al., Science 328, 1658 (2010)