Dresden 2026 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 96: Plasmonics and nanooptics: Fabrication, characterization and applications

O 96.4: Vortrag

Freitag, 13. März 2026, 10:15–10:30, HSZ/0403

Launching and confining In-Plane Hyperbolic Phonon Polaritons in α-MoO₃ with In₃SbTe₂ nanostructures — •Umberto Saldarelli¹, Lina Jäckering¹, Lukas Conrads¹, Matthias Wuttig¹, Pablo Alonso-González^2,3, and Thomas Taubner¹ — ¹I. Institute of Physics (IA), RWTH Aachen University — ²Department of Physics, University of Oviedo — ³Center of Research on Nanomaterials and Nanotechnology, CINN (CSIC-Universidad de Oviedo)

Alpha-phase molybdenum trioxide (α-MoO₃), a van der Waals material, supports in-plane hyperbolic phonon polaritons (HPPs) with high confinement, low losses, and extremely directional propagation [1]. Rapid prototyping of nanostructures for tailoring polaritons can be achieved with the plasmonic phase-change material In₃SbTe₂ (IST) [2], switchable between amorphous and crystalline phases via laser-induced heating. This has been already shown for programmable resonator structures within hBN [3]. Here we combine α-MoO₃ with IST. We use scattering-type scanning near-field optical microscopy (s-SNOM) to explore HPP launching by antennas of different orientations. Next, we optically program a circular launching structure to focus polaritons. Finally, adding a second focusing disk and reconfiguring the disk distance, we tailor field enhancement and confinement. Our results enable rapid design of reconfigurable structures and provide an all-optical material platform for controlling in-plane HPPs. [1] Ma et al. Nat. 562, 557-562, (2018) [2] Conrads et al. Opt. Mat. Expr. 15, 2664-2687, (2025) [3] Jäckering et al. Nano Lett. 25, 15809, (2025)

Keywords: hyperbolic phonon-polaritons; phase-change material; MoO3; s-SNOM