Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 78: Plasmonics and Nanooptics 3

O 78.1: Vortrag

Freitag, 9. September 2022, 10:30–10:45, H3

Reconfiguring magnetic resonances with the plasmonic phase-change material In₃SbTe₂ — •Lukas Conrads, Andreas Heßler, Konstantin Wirth, Matthias Wuttig, 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. The SRRs are further modified into crescents and J-antennas, which feature more complex resonance modes dependent on the polarization of the incident light [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] Heßler, Conrads et al. ACS Photonics 9, 5 (2022)