SKM 2021 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 3: Poster Session I

HL 3.3: Poster

Montag, 27. September 2021, 10:00–13:00, P

Near-field terahertz spectroscopy of flakes of 2D materials — •Ahmad-Reza Etemadi, Sebastian Matschy, Ahana Bhattacharya, and Martin Mittendorff — Department of physics, University of Duisburg-Essen, 47057 Duisburg, Germany

THz spectroscopy is a powerful tool to investigate the carrier dynamics in many materials. Unfortunately, gaining access to the THz conductivities of small samples, e.g. flakes of 2D materials, is rather difficult, as the THz spot size is much larger than the structure of interest. Direct detection in the near-field improves the spatial resolution and can be done by placing the sample directly on top of an electro-optic crystal. A near-infrared (NIR) beam is exploited to probe the THz field in the vicinity of the flake. The spatial resolution of the experiment is mostly determined by the NIR beam size in the electro-optic crystal and the diffraction of the THz beam by the sample. Here we analyze the potential performance of such a THz near-field microscope and present the current stage of our instrument.