SurfaceScience21 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 40: Poster Session III: Poster to Mini-Symposium: Infrared nano-optics I

O 40.3: Poster

Dienstag, 2. März 2021, 10:30–12:30, P

Reconfiguring magnetic resonances with the plasmonic phase-change material In₃SbTe₂ — Andreas Heßler, •Lukas Conrads, Konstantin Wirth, Matthias Wuttig, and Thomas Taubner — Institute of Physics (IA), RWTH Aachen University

Phase-change materials (PCMs) have been established as promising materials for tunable nanophotonic devices [1]. Normally, they feature a large optical contrast between their dielectric amorphous and crystalline phases. However, the recently introduced plasmonic PCM In₃SbTe₂ (IST) changes from dielectric to metallic in the infrared upon crystallization which enables novel resonance tuning mechanisms and direct laser writing of plasmonic nanostructures [2]. Here, directly optically written metallic, crystalline IST antennas with electric dipole (ED) resonances are first reconfigured into split-ring resonators (SRRs) with ED and magnetic dipole (MD) resonances by local optical switching. By selectively decreasing the arm lengths of the SRRs with reamorphizing laser pulses, we demonstrate tuning of the MD resonances by more than 2.4 µm, while the ED resonances for the same polarization are unchanged. Our work may pave the way towards engineering ultrathin, tunable, plasmonic devices for infrared nanophotonics which rely on separate tuning and superposition of ED and MD resonances.

[1] M. Wuttig, H. Bhaskaran and T. Taubner. Nature Photonics 11, 465-476 (2017)

[2] A. Heßler, S. Wahl, T. Leuteritz et al.. in submission at Nature Communications (2020)