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O: Fachverband Oberflächenphysik

O 28: Poster Session - Scanning Probe techniques: Method Development

O 28.5: Poster

Montag, 16. März 2020, 18:15–20:00, P1A

Setup of a THz-STM for pump-probe experiments using a commercial THz-source — •Philip Kapitza, Hüseyin Azazoglu, and Rolf Möller — Fakultät für Physik/Cenide, Universität Duisburg-Essen, Germany

To study the excitations of single atoms or molecules on their intrinsic timescales ultrafast temporal and atomic-scale spatial resolution is essential. This can be achieved by combining the very high spatial resolution of a scanning tunneling microscope (STM) with picosecond duration terahertz (THz) pulses. When coupled to the tip of a STM the THz pulses can modulate the bias voltage in the tunneling junction [1,2,3]. The setup presented on this poster consists of a homebuilt low-temperature STM (LT-STM) and a commercial THz-pulse source for time domain spectroscopy (THz-TDS). The THz-emitter of this THz-TDS system is a photoconducting antenna irradiated by a fs-IR laser. For pump-probe experiments using the THz-pulses two THz-emitters will be used with both terahertz beams focused onto the tip. The time delay between the pump and the probe pulse will be created by splitting the beam of the fs-IR laser with one part of the beam going through an optical delay line.

[1] Cocker, T. L. et al., Nat. Photon. 7, 620-625 (2013).

[2] Cocker, T. L. et al., Nature 539, 263-267 (2016).

[3] Yoshioka, K. et al., Nat. Photon. 10, 762-765 (2016).