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  4. Tunable Room-Temperature Polaritons in the Very Strong Coupling Regime in Quasi-2D Ruddlesden-Popper Perovskites
 
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2025
Journal Article
Title

Tunable Room-Temperature Polaritons in the Very Strong Coupling Regime in Quasi-2D Ruddlesden-Popper Perovskites

Abstract
Layered perovskites are an emergent class of materials, which feature extraordinarily large light–matter coupling, driven by excitons with binding energies significantly beyond the thermal energy at room-temperature. In this work, widely tunable room-temperature cavity exciton polaritons are demonstrated at the cross-over from the strong coupling to the very strong coupling regime in mechanically exfoliated crystals of quasi-2D Ruddlesden–Popper iodide perovskite (BA)2(MA)2Pb3I10 embedded in an open microcavity. The coupled exciton-cavity system features a Rabi-splitting up to ΩR ≃155 meV, exceeding the experimentally determined exciton binding energy of Eb = 100 ± 10 meV and thus operates at the onset of the very strong coupling regime, in which the light–matter coupling alters the interaction of electron and hole. This combined experimental-theoretical effort provides a consistent microscopic picture successfully describing the observed peculiar scaling of the Rabi-splitting with an increasing effective cavity length. These findings provide a foundation for future on-chip applications involving tunable polaritonic and nonlinear optical devices based on strongly coupled perovskite systems.
Author(s)
Pashaei-Adl, Hamid
Universität Oldenburg
Bennenhei, Christoph
Universität Oldenburg
Struve, Marti
Universität Oldenburg
Peksa, Paulina
Laboratoire National des Champs Magnétiques Intenses (LNCMI)
Dyksik, Mateusz
Politechnika Wrocławska
Baranowski, Michał
Politechnika Wrocławska
Song, Kok Wee
Xiamen University Malaysia
Gittinger, Moritz
Universität Oldenburg
Lienau, Christoph T.
Universität Oldenburg
König, Jonas K.
Philipps-Universität Marburg
Fitzgerald, Jamie M.
Philipps-Universität Marburg
Jasti, Naga Prathibha
Weizmann Institute of Science Israel
Eilenberger, Falk  
Fraunhofer-Institut für Angewandte Optik und Feinmechanik IOF  
Płochocka, Paulina
Laboratoire National des Champs Magnétiques Intenses (LNCMI)
Malić, Ermin
Philipps-Universität Marburg
Kyriienko, Oleksandr
The University of Sheffield
Esmann, Martin
Universität Oldenburg
Schneider, Christian
Universität Oldenburg
Journal
Advanced optical materials  
File(s)
Download (1.54 MB)
Rights
CC BY 4.0: Creative Commons Attribution
DOI
10.1002/adom.202501392
10.24406/publica-5658
Additional full text version
Landing Page
Language
English
Fraunhofer-Institut für Angewandte Optik und Feinmechanik IOF  
Keyword(s)
  • exciton-polariton

  • open optical microcavity

  • quasi-2D perovskites

  • very strong coupling regime

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