Dresden 2026 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 57: Plasmonics and nanooptics: Light-matter interaction, spectroscopy II
O 57.3: Vortrag
Mittwoch, 11. März 2026, 11:15–11:30, HSZ/0403
Intrinsic plasmon canalization in the natural biaxial van-der-Waals material MoOCl2 — •Farid Aghashirinov1, Andrea Manchini2, Lin Nan2, Giacomo Venturi2, Nicola Melchioni2, Florian Mangold1, Bettina Frank1, Antonio Ambrosio2, and Harald Giessen1 — 14-th Physics Institute, University of Stuttgart, Stuttgart, Germany — 2Vectorial Nano-Imaging, Istituto Italiano di Tecnologia, Milano, Italy
We investigate directional near-infrared plasmon polaritons in exfoliated MoOCl2 flakes on SiO2 substrates, excited using gold disk nanoantennas and probed with scattering-type scanning near-field optical microscope (s-SNOM). MoOCl2 is a natural van der Waals material that supports low-loss, in-plane hyperbolic plasmons and exhibits strong optical anisotropy: polarization along the short axis yields metallic behaviour, while alignment with the long axis produces a dielectric response [1]. Using a widely tunable broadband laser from Stuttgart Instruments, we map the polariton dispersion across a broad spectral range and identify distinct propagation regimes. In our work, we observe plasmon-polariton canalization for the first time, where wavefronts propagate without divergence. These measurements highlight MoOCl2 as a broadband, highly directional natural polaritonic platform.
[1] G. Venturi et al., Nat Commun 15, 9727 (2024)
Keywords: Scattering s-SNOM; 2D van-der-Waals material; Hyperbolic material; Tunable broadband laser; Plasmon canalization