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O: Fachverband Oberflächenphysik

O 46: Plasmonics and Nanooptics IV: Fabrication and Applications

O 46.3: Talk

Wednesday, March 20, 2024, 11:00–11:15, MA 042

Comparison of plasmonic and dielectric phase-change materials by modifying magnetic infrared resonances — •Lukas Conrads, Andreas Heßler, 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, we demonstrate tuning magnetic dipole (MD) resonances of split-ring resonators (SRRs) by modifying the arm length of IST SRRs [3] and by locally addressing the antenna hotspots of aluminum SRRs covered by amorphous Ge₃Sb₂Te₆ [4]. Finally, we compare both PCMs by investigating the MD resonance tuning of slit antennas [5]. 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 Photon. 9, 5 (2022) [4] Conrads et al., Adv. Opt. Mat. 11, 17 (2023) [5] Conrads et al., ACS Nano submitted

Keywords: Metasurface; Phase-Change Materials; In3SbTe2 (IST); Local Addressing