Regensburg 2025 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 72: Poster Plasmonics and Nanooptics: Light-Matter Interaction, Spectroscopy

O 72.11: Poster

Mittwoch, 19. März 2025, 18:00–20:00, P2

Optical resonance tuning of micro- and nanoparticles with phase change materials in the near-infrared and visible range — •Rebecca Rahmel, Hristiyana Kyoseva, Jonathan Müller, Lukas Conrads, Thomas Taubner, and Gero von Plessen — I. Institute of Physics (IA), RWTH Aachen University

Micro- and nanoparticles with scattering and absorption resonances promise interesting optical behaviour. These resonances are highly sensitive to the particle size, shape, and configuration, as well as the dielectric properties of both particle and surrounding medium [1]. Phase-change materials (PCMs) show high optical contrast when switched between their amorphous and crystalline phases [2], facilitating antenna resonance tuning based on a change in refractive index [3]. The novel plasmonic PCM In₃SbTe₂ (IST) can be locally optically switched between the dielectric amorphous and the metallic (in the infrared) crystalline phase, enabling a sign change in permittivity [4]. While antenna resonance tuning with PCMs has been studied extensively, locally addressing PCMs below single particles has not been demonstrated yet. Here, we investigate the optical response of single polysterene micro- and gold nanoparticles placed on thin films of IST and other PCMs and locally switch the PCMs to tune the particle resonances. Our work paves the way towards mode selection of nanoparticles beneficial for tuning of emitters and sensing applications.

[1] Dahmen et al. Aust. J. Chem. 60, 447-456 (2007) [2] Wuttig et al. Nature Photon 11, 465-476 (2017) [3] Michel et al. Adv. Mater. 31, 1901033 (2019) [4] Heßler et al. Nat. Com. 12, 924 (2021)

Keywords: Phase Change Materials; Nanophotonics; Nanoparticles