SKM 2023 – scientific programme

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O: Fachverband Oberflächenphysik

O 91: Plasmonics and Nanooptics V: Waveguides and Antennas

O 91.8: Talk

Friday, March 31, 2023, 12:15–12:30, CHE 89

Reconfiguring magnetic resonances with plasmonic and dielectric phase-change materials — Lukas Conrads, Andreas Heßler, Sebastian Meyer, Konstantin Wirth, Matthias Wuttig, Dimitry Chigrin, and •Thomas Taubner — I. Institute of Physics (IA), RWTH Aachen University

For miniaturized active nanophotonic components, resonance tuning of nanoantennas is a key ingredient. Phase-change materials (PCMs) have been established as prime candidates for non-volatile resonance tuning based on a change in refractive index [1]. Currently, a novel material class of switchable infrared plasmonic PCMs, like In₃SbTe₂ (IST), is emerging. Since IST can be locally optically switched between dielectric (amorphous phase) and metallic (crystalline phase) states in the whole infrared range, it becomes possible to directly change the geometry and size of nanoantennas to tune their infrared resonances [2]. Here, crystalline IST split-ring resonators (SRRs) are directly optically written and reconfigured in their arm size to continuously tune their magnetic dipole resonances over a range of 2.4 µm without changing their electric dipole resonances. Furthermore, electric and magnetic dipole resonances of aluminum SRRs covered by the conventional PCM Ge₃Sb₂Te₆ can be individually tuned by addressing the hotspots locally [3]. Our concepts are well-suited for rapid prototyping, speeding up workflows for engineering ultrathin, tunable, plasmonic devices for infrared nanophotonics, telecommunications or (bio)sensing.

[1] Wuttig et al., Nat. Photon. 11, 465 (2017) [2] Heßler et al., Nat. Commun. 12, 924 (2021) [3] Conrads et al. Adv. Mat. submitted