https://doi.org/10.1051/epjconf/202328705001
Controlling the strong light-matter coupling in metal-dielectric optical resonators using spin-crossover molecules
1 Laboratoire de Chimie de Coordination, CNRS UPR 8241, Université de Toulouse, 205 route de Narbonne, F-31077 Toulouse, France
2 Laboratoire d’Analyse et d’Architecture des Systèmes, CNRS UPR 8001, Université de Toulouse, 7 avenue du colonel Roche, F-31400 Toulouse, France
* Corresponding author: karl.ridier@lcc-toulouse.fr; azzedine.bousseksou@lcc-toulouse.fr
Published online: 18 October 2023
We report the observation of (ultra)strong light-matter coupling, in the UV spectral region, between optical modes of a metal/dielectric bilayer nanocavity and the electronic excitations of spin-crossover (SCO) molecules. By thermally switching the SCO molecules between their low-spin and high-spin states, we demonstrate the possibility of fine-tuning the light-molecule hybridization strength, allowing a reversible switching between strong- (with Rabi splitting values of up to 550 meV) and weak-coupling regimes within a single photonic resonator. As a result, we show that spin-crossover molecular compounds constitute a novel, promising class of active nanomaterials in the context of tuneable and reconfigurable polaritonic devices.
© The Authors, published by EDP Sciences, 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
