SurfaceScience21 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 40: Poster Session III: Poster to Mini-Symposium: Infrared nano-optics I

O 40.5: Poster

Dienstag, 2. März 2021, 10:30–12:30, P

SNOM-examination of THz polaritons in the van der Waals crystal α-MoO3 — •Maximilian Obst¹, Thales V. A. G. de Oliveira^{1, 2}, Tobias Nörenberg^{1, 3}, Susanne C. Kehr¹, and Lukas M. Eng^{1, 3} — ¹Institute of Applied Physics, Technische Universität Dresden, Germany — ²Helmholtz-Zentrum Dresden-Rossendorf — ³ct.qmat: Dresden-Würzburg Cluster of Excellence - EXC 2147, Technische Universität Dresden, Germany

The confinement of electromagnetic fields to the nanometer length scale is of great importance for advancing nanophotonic technologies, since allowing for enhanced light-matter interaction. For terahertz (THz) radiation, extreme field confinement can be achieved via the excitation of low-loss phonon-polaritons e.g. in van der Waals (vdW) crystals.

Nevertheless, experimentally proving such highly-confined phonon-polaritons at THz frequencies is very challenging. In the present work, we combine scattering-type scanning near-field optical microscopy (s-SNOM) with an IR-2-THz free-electron laser, in order to enable nanometer-scale optical resolution at narrow-band and tunable THz excitation. This poster presents measurements of low-loss polaritonic excitations at frequencies between 8 to 12 THz in the vdW semiconductor α-MoO3[1].

[1] T.V.A.G. de Oliveira et al., Advanced Materials 2005777 (2020)