Publication date: 15th December 2025
In recent years, high optical quality (i.e., negligible diffuse scattering) nanostructured perovskite films displaying intense excitonic bands have been integrated into Fabry-Pérot resonators, giving rise to strong light-matter coupling.[1-3] Under this regime, the electronic and photonic structure of the perovskite-cavity system undergoes a reconfiguration that gives rise to new hybrid light-matter states known as exciton-polaritons, which determine the absorption and emission properties of the ensemble. These advances have yielded significant milestones, like the observation of Bose-Einstein condensation in both two-dimensional (2D) perovskites[4] and quantum dot solids,[5] the latter at room temperature, as well as the possibility to study complex physical phenomena.[6]
In this talk, we will describe an alternative approach to achieve strong light-matter coupling in two-dimensional (2D) Ruddlesden-Popper perovskites integrated in optical cavities.[S. Gallego et al., In preparation] We will show that mesoporous scaffolds presenting a narrow nanopore size distribution provide unique opportunities both to (i) control the quality and phase-purity of the 2D perovskite synthesized within them, featuring single phase large transition dipole moments, and (ii) achieve intense and spectrally tunable cavity resonances, hence favoring the precise design of exciton-polaritons. Fine control of the cavity size, achieved by means of the precise control of the scaffold thickness, permits to accurately determine the absorption and emission properties of the ensemble, which displays the characteristic anticrossing behavior of the upper and lower polaritonic branches, a significant Rabi splitting above 200 meV and tunable photoluminescence properties fully controlled by the lower polariton.
This project has received funding from the Spanish Ministry of Science and Innovation under grant PID2023-149344OB-100 funded by MCIN/AEI/10.13039/501100011033 and FEDER/UE and Junta de Andalucía under grant DGP_PIDI_2024_00821. D.O.T acknowledges financial support from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 956270. L.S. acknowledges project MMT_ICMS01, funded by the Momentum Programme (European Union NextGenerationEU/PRTR).
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