Hannover 2016 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 58: Poster: Quantum Optics and Photonics IV

Q 58.56: Poster

Donnerstag, 3. März 2016, 16:30–19:00, Empore Lichthof

A scanning tunneling microscope joined with few-cycle laser pulses — •Michal Hamkalo, Takuya Higuchi, M. Alexander Schneider, and Peter Hommelhoff — Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg(FAU), 91058 Erlangen

Sharp metal tips are not only essential to perform scanning tunneling microscopy (STM), but also extremely interesting from the point of view of strong field physics as the apex of such a tip exhibits a large optical field enhancement. Due to this feature it is possible to achieve electric fields of the order of 1 V/Å and to enter the light-field-induced tunneling photoemission regime. Electrons resulting from this process rescatter at a distance of a few nanometers from tip surface [1]. When the tip apex is approached to another surface within such a distance, electrons are expected to tunnel in between the tip and the surface within a subcycle of the oscillating field. A tip-to-tip interface is an attracting playground for seeking such optical-field driven tunneling over a gap, but the mechanical instability of the previous setup hindered to reach this tunneling regime [2]. In this study, a STM-based setup with optical access was built and used to investigate tip-to-tip and tip-to-surface interfaces illuminated with few-cycle laser pulses.

1. M. Krüger, M. Schenk and P. Hommelhoff, Nature 475, 78 (2011).

2. T. Higuchi et al., Appl. Phys. Lett. 106, 051109 (2015).