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Authors Black, M.; Asadi, M.; Darman, P.; Seçkin, S.; Schillmöller, F.; König, T. A. F.; Darbari, S.; Talebi, N.
Title Long-range self-hybridized exciton-polaritons in two-dimensional Ruddlesden-Popper perovskites
Date 16.10.2024
Number 0
Abstract Lead halide perovskites have emerged as platforms for exciton-polaritonic studies at room temperature, thanks to their excellent photoluminescence efficiency and synthetic versatility. In this work, we find proof of strong exciton–photon coupling in cavities formed by the layered crystals themselves, a phenomenon known as the self-hybridization effect. We use multilayers of high-quality Ruddlesden–Popper perovskites in their 2D crystalline form, benefiting from their quantum-well excitonic resonances and the strong Fabry–Pérot cavity modes resulting from the total internal reflection at their smooth surfaces. Optical spectroscopy reveals bending of the cavity modes typical for exciton-polariton formation, and absorption and photoluminescence spectroscopy shows splitting of the excitonic resonance and thickness-dependent peak positions. Strikingly, local optical excitation with energy below the excitonic resonance of the flakes in photoluminescence measurements unveils the coupling of light to in-plane polaritonic modes with directed propagation. These exciton-polaritons exhibit high coupling efficiencies and extremely low loss propagation mechanisms, which are confirmed by finite difference time domain simulations. Thus, we prove that mesoscopic 2D Ruddlesden–Popper perovskite flakes represent an effective but simple system to study the rich physics of exciton-polaritons at room temperature.
Publisher American Chemical Society
Wikidata
Citation ACS Photonics 11 (2024) 4065-4075
DOI https://doi.org/10.1021/acsphotonics.4c00824
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