Dresden 2026 – scientific programme

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O: Fachverband Oberflächenphysik

O 26: Plasmonics and nanooptics: Fabrication, characterization and applications – Poster

O 26.5: Poster

Monday, March 9, 2026, 18:00–20:00, P2

Reconfiguring resonator shapes optically to tailor the resonator modes of phonon polaritons in hBN using In₃SbTe₂ — •Arvid Schick, Lina Jäckering, Lukas Conrads, Matthias Wuttig, and Thomas Taubner — I. Institute of Physics (IA), RWTH Aachen University

The van der Waals material hexagonal boron nitride (hBN) hosts hyperbolic Phonon Polaritons (HPPs) with high volume confinement and low losses, suitable for nanophotonic devices [1]. Restricting the HPPs to resonators enables ultra-confined resonances [2]. Conventionally, resonator fabrication requires cumbersome lithography processes. Instead, resonators can be fabricated via optical programming of the phase-change material In₃SbTe₂ (IST), as IST can reversibly be switched between a metallic and a dielectric phase in the infrared [3]. Optical programming of reconfigurable, circular resonators for HPPs in hBN has been demonstrated and allowed for tailoring the field confinement [4]. We investigate square, rectangular and triangular resonators. We reconfigure resonator shape and aspect ratio to tailor the resonator modes that we investigate with scattering-type scanning near-field optical microscopy (s-SNOM). By decreasing the resonator size, we find confinement of up to λ/69 and a Q-factor of 49. Our results pave the way for rapid and reconfigurable prototyping of confined polariton resonators of arbitrary shape for various 2D materials. [1] Dai et al. Science 343, 1125-1129 (2014); [2] Sheinfux et al. Nat. Mat. 23, 499-505 (2024); [3] Conrads et al. Opt. Mater. Express 15, 2664-2687 (2025); [4] Jaeckering et al. Nano Lett. 25, 15809, (2025)

Keywords: Van der Waals materials; Resonators; Phase-Change Materials; Hyberbolic Phonon Polaritons; s-SNOM