Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 35: Poster Tuesday: Plasmonics and Nanooptics 1

O 35.2: Poster

Dienstag, 6. September 2022, 11:00–13:00, P3

Investigation of the plasmonic Phase-Change Materials AgSnTe₂ and In₃SbTe₂ for tuning nanoantenna resonances — •Kilian Wilden, Lukas Conrads, Andreas Hessler, Matthias Wuttig, and Thomas Taubner — I. Institute of Physics (IA), RWTH Aachen University

Providing a high optical contrast between their amorphous and crystalline phases, phase-change materials (PCMs) can serve for many applications in nanophotonics. [1] Optical pulses can be used for switching between those two states. This enables the tunability of antenna resonances by changing the surrounding medium. Currently, a novel material class of switchable infrared plasmonic PCMs is rising, which is characterized by a negative permittivity and therefore a Drude-like behaviour in the crystalline. This plasmonic PCM In₃SbTe₂ (IST) offers resonance tuning by reconfiguring the antenna shapes of rod antennas and even more complex ones with magnetic resonances.[2] AgSnTe₂ (AST) is another plasmonic PCM with a smaller plasma frequency and higher plasmonic losses than IST. Here, we investigate directly optically written antenna structures of crystalline AST. The quality of the plasmonic resonances is compared to IST antennas. Furthermore, the well-established concepts of reconfiguring antenna geometries are applied to inverse antenna structures, in which amorphous holes are created in a crystalline plasmonic surrounding. Their resonance behavior can be described by Babinet’s principle. [1] M. Wuttig, H. Bhaskaran and T. Taubner, Nature Photonics 11, 465-476 (2017). [2] A. Heßler et al., Nature Communications 12, 924 (2021).