Dresden 2026 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 26: Poster II
HL 26.37: Poster
Mittwoch, 11. März 2026, 09:30–11:30, P1
Phonon-Polaritons in MOVPE-grown hexagonal Boron Nitride — •Oskar Schröer1, Maximilian Scharpey1, Lena Miler2, Johannes Binder2, Andrzej Wysmołek2, Daniel Wigger3, and Iris Niehues1 — 1Institute of Physics, University of Münster, Germany — 2Faculty of Physics, University of Warsaw, Poland — 3Department of Physics, University of Münster, Germany
Two-dimensional materials composed of atomically thin layers have attracted great interest due to their unique optical and electronic properties. Using a scattering-type scanning near-field optical microscope (s-SNOM), surface phonon polaritons (SPhPs) are observable in the insulating polar van-der-Waals material hexagonal boron nitride (hBN) [1]. While most works focus on exfoliated single-crystalline layers of hBN, we show that SPhPs can also be excited in hBN grown by metalorganic vapor phase epitaxy (MOVPE). Here, grain boundaries and defects play a major role for the propagation properties of the polaritons. By evaluating the real-space interference patterns, we extract dispersion relations and compare propagation characteristics for the two sample types. The results contribute to a deeper understanding of light-matter interactions in polar van der Waals materials and may pave the way towards improved control and manipulation of light-matter excitations on the nanometer scale.
[1] Caldwell et al., Nat. Commun. 5, 5221 (2014).
Keywords: hBN; Surface Phonon Polariton; MOVPE; Near-field; Infrared