Regensburg 2025 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 18: Focus Session: Nanoscale Light-matter Interaction I
HL 18.4: Hauptvortrag
Dienstag, 18. März 2025, 11:15–11:45, H17
Ultra-confined THz hyperbolic phonon polaritons in a transition metal dichalcogenide — Ryan A. Kowalski1, Niclas S. Mueller2, Gonzalo Alvarez-Perez3, Maximilian Obst4, Katja D. Granados1, Giulia Carini2, Aditha Senarath1, Saurabh Dixit1, Richarda Niemann1,2, Ragu B. Iyer5, Felix Kaps4, Jakob Wetzel4, J. Michael Klopf6, Ivan I. Kravchenko7, Deliang Bao1, Sokrates T. Pantelides1, Martin Wolf2, Lukas Eng4, Pablo Alonso-Gonzalez3, Susanne Kehr4, Thomas G. Folland5, •Alexander Paarmann2, and Joshua D. Caldwell1 — 1Vanderbilt University, Nashville, TS, USA — 2Fritz Haber Institute of the Max Planck Society, Berlin, Germany — 3University of Oviedo, Oviedo, Spain — 4TUD Dresden University of Technology, Dresden, Germany — 5The University of Iowa, Iowa City, IA, USA — 6Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 7Oak Ridge National Laboratory, TN, USA
Phonon polaritons are hybrid light-matter quasiparticles in polar crystals that enable waveguiding of light on length scales much smaller than the photon wavelength. Here, we introduce HfSe2 as a new van der Waals material that supports phonon polaritons in the terahertz (THz) spectral range. Using THz near-field optical microscopy, we demonstrate extreme confinement of light from 61 µm free-space wavelength to 245 nm. We show that the origin of this record-high confinement is an exceptionally large light-matter coupling of hyperbolic HfSe2.
Keywords: Nano-optics; Polaritons; Terahertz; Near-field optical microscopy; 2d materials