Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 57: Plasmonics and nanooptics: Light-matter interaction, spectroscopy II

O 57.5: Vortrag

Mittwoch, 11. März 2026, 11:45–12:00, HSZ/0403

Optical resonance tuning of single polystyrene microspheres using the phase-change material In₃SbTe₂ as a switchable mirror — •Rebecca Rahmel, Hristiyana Kyoseva, Lukas Conrads, Thomas Taubner, and Gero von Plessen — I. Institute of Physics (IA), RWTH Aachen University

The optical resonances of dielectric nanoparticles and microparticles can be modified via their size, shape and configuration [1]. Dielectric particles in particle-on-mirror (PoM) geometries show rich optical responses due to their low losses and electric and magnetic multipolar Mie modes [2]. Cueff et al. introduced the concept of a switchable mirror to tune the resonances of dipole emitters using the phase-transition material VO₂ [3]. Here we tune the infrared multipolar Mie resonances of dielectric polystyrene (PS) microspheres using a switchable mirror made of the phase-change material In₃SbTe₂ (IST). IST exhibits a phase change between an amorphous dielectric and crystalline metallic phase in the infrared [4,5] and can be locally switched under the PS microspheres, creating a PoM geometry. Measuring the scattering spectra of the PS microspheres before and after switching, we achieve huge shifts of the resonance wavelength from 5.2 to 8.9 µ m. Our work is a first step towards the controlled tuning of multipolar Mie modes of various particles using reprogrammable IST mirror structures.

[1] Kuznetsov et al. Science 354, aag2472 (2016) [2] Yao et al. ACS Nano 18, 26, 16545-16555, (2024) [3] Cueff et al. Nat. Com. 6, 8636 (2015) [4] Heßler et al. Nat. Com. 12, 924 (2021) [5] Conrads et al. Opt. Mat. Ex. 15, 2664-2687 (2025)

Keywords: nanoparticles; microparticles; phase-change materials; Mie resonances; particle-on-mirror