Dresden 2026 – scientific programme

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O: Fachverband Oberflächenphysik

O 96: Plasmonics and nanooptics: Fabrication, characterization and applications

O 96.7: Talk

Friday, March 13, 2026, 11:00–11:15, HSZ/0403

Hybrid Gold–Vanadium-Dioxide Tunable Plasmonic Devices — Rostislav Řepa, Jiří Kabát, Jiří Liška, Peter Kepič, Michal Horák, Tomáš Šikola, and •Vlastimil Křápek — Brno University of Technology, Brno, Czechia

Vanadium dioxide (VO₂) exhibits a metal-insulator transition near room temperature, which can be exploited in tunable plasmonic devices with compelling functions. However, devices based solely on VO₂ suffer from a large optical absorption and low chemical stability of VO₂ [1].

We present a hybrid material platform that combines high-quality crystalline self-assembled VO₂ nanoparticles [2] with lithographically defined gold nanostructures in a lateral arrangement In this way, we benefit from both the tunability of VO₂ and the high conductivity of gold. The lateral arrangement minimizes the amount of VO₂ and thus contributes to the high quality of the devices.

We demonstrate two tunable plasmonic devices based on the above-mentioned material platform: (1) Electric-magnetic switches, in which either an electric or magnetic hot spot is formed, following a design from Ref. [3]. (2) Resonance-energy switches, in which the spectral profile of the scattering or absorption is controlled, with possible applications in selectively-enhanced photoluminescence.

[1] Krpenský et al., Nanoscale Adv. 6, 3338–3346 (2024).

[2] Horák et al., arXiv:2408.11972.

[3] Křápek et al., Nanophotonics 9, 623–632 (2020).

Keywords: plasmonic devices; reconfigurable plasmonics; vanadium dioxide; spectral switch; hot spot