Regensburg 2019 – scientific programme
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O: Fachverband Oberflächenphysik
O 72: Poster Wednesday: Scanning Probe Techniques
O 72.10: Poster
Wednesday, April 3, 2019, 17:45–20:00, Poster B2
A Time and Spatially Resolved Study of the Thermal Response of the Tip of a Scanning Tunneling Microscope on Pulsed Optical Excitation — •Georg Alexander Traeger1,3, Taner Esat1,2, Martin Wenderoth3, and Jungseok Chae1,2 — 1Center for Quantum Nanoscience (QNS), Institute for Basic Science (IBS), Seoul, Republic of Korea — 2Department of Physics, Ewha Womans University, Seoul, Republic of Korea — 3IV. Physics Institute, Georg- August-University, Göttingen, Germany
Combining Scanning Tunneling Microscopy (STM) and pulsed optical excitation was already envisioned in the early 1990s. [1] In this approach, disentangling thermal effects due to heating of the tip from optically induced dynamics of the sample has always been a major issue. Grafström et al. [2] sytematically investigated the thermal response on sinusoidal stimulus up to 100 kHz. Only recently, Kloth et al. [3] estimated thermal effect of pulsed optical excitation based on the shaken pulse pair excitation up to several nanoseconds. Using an electro-optical modulator, we investigate the thermal response of a W tip/Cu(111) surface from the low up to the high frequency regime. In combination with the raster-scanned laser focus, we have access to both time and spatially thermal response of the tip under optical excitation. [1] Weiss et al. APL. 63, 18 (1993) [2] Grafstrbm et al. J. of Vac. Sci. & Tech. B 9, 568 (1991) [3] Kloth et al. Rev. Sci. Instr. 87, (2016).