Regensburg 2025 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

O: Fachverband Oberflächenphysik

O 60: Plasmonics and Nanooptics: Fabrication, Characterization and Applications I

O 60.4: Talk

Wednesday, March 19, 2025, 11:15–11:30, H8

Optical programming of Hyperbolic Phonon Polariton Resonators with the plasmonic phase-change material In₃SbTe₂ — •Aaron Moos, Lina Jäckering, Lukas Conrads, Matthias Wuttig, and Thomas Taubner — I. Institute of Physics (IA), RWTH Aachen University, Germany

Tailoring light at the nano scale is mandatory for creating new nanophotonic devices and is achievable with polaritons. Hexagonal Boron Nitride (hBN), a 2d van der Waals material, hosts Hyperbolic Phonon Polaritons (HPPs) featuring high volume-confinement and low losses [1]. Restricting HPPs to resonators enables ultra-confined resonances, but their fabrication requires cumbersome etching processes [2]. Instead, resonators can be fabricated via optical programming of a phase-change material like In₃SbTe₂ (IST) with a metallic and a dielectric state in the infrared enabling rapid fabrication and reconfigurability. IST resonators combined with surface polaritons on bulk SiC were exploited before [3]. Here, we show optical programming of circular IST resonators below 2d hBN and investigate the HPP mode structures with scattering-type scanning near-field optical microscopy (s-SNOM). Influences of hBN thickness and resonator-size on resonances are studied. Furthermore, we show focussing of free propagating HPPs launched by a crystalline IST structure with tuneable focal length by reconfiguring. Our results enable rapid prototyping of confined polariton resonators for infrared nanophotonics. [1] Dai et al., Science 343, 1125-1129 (2014), [2] Sheinfux et al., Nat. Mat. 23, 499-505 (2024), [3] Conrads et al., Nat. Com. 15, 3472 (2024)

Keywords: s-SNOM; Hyperbolic Polaritons; Resonators; Phase-Change Materials