SKM 2023 – scientific programme

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O: Fachverband Oberflächenphysik

O 70: Poster: Plasmonics and Nanooptics II

O 70.5: Poster

Wednesday, March 29, 2023, 18:00–20:00, P2/EG

Optical writing of switchable mid-infrared surface phonon polariton resonators with the plasmonic phase-change material In₃SbTe₂ — •Luis Schüler, Lukas Conrads, Konstantin Georg Wirth, Matthias Wuttig, and Thomas Taubner — I. Institute of Physics (IA), RWTH Aachen University

Chalcogenide-based phase-change materials (PCMs) are prime candidates for active nanophotonics. They can be reversibly switched between an amorphous and a crystalline state, which exhibit a strong contrast in optical and electrical properties [1]. Therefore, PCMs can be used, for example, to tune surface phonon polariton (SPhP) resonances in the infrared [2]. The recently introduced PCM In₃SbTe₂ (IST) possesses a crystalline phase which is metallic in the entire infrared range. It allows for direct writing of arbitrary resonant structures in a dielectric surrounding [3], which could also confine SPhPs in cavities of subwavelength size. However, an investigation of different confined modes in those cavities with IST has not been performed yet. Here, we investigate IST on a SiC substrate. By laser-induced phase switching, we define various SPhP resonator structures, such as circular cavities, and measure their resonant behavior with optical near- and far-field methods. This study is a first step towards rapid prototyping of switchable SPhP resonators of arbitrary shape that could be employed, for example, in chemical sensing and active metasurfaces.

[1] Wuttig, M. et al. Nature Photonics 11, 465-476 (2017).

[2] Sumikura, H. et al. Nano Letters 19, 2549-2554 (2019).

[3] Heßler et al. Nature Communications 12, 924 (2021).