Journal
NANO LETTERS
Volume 21, Issue 14, Pages 6124-6131Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c01504
Keywords
2D perovskites; Fano interference; light-matter interactions; plasmonics; strong-coupling; butylammonium lead iodide
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Funding
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, as part of the Energy Frontier Research Centers program: CSSAS-The Center for the Science of Synthesis Across Scales [DE-SC0019288]
- German Academic Exchange Service (DAAD)
- German Federal Ministry of Education and Research (BMBF)
- European Union [605728]
- Office of Naval Research [N00014-17-1-2201]
- National Science Foundation [NNCI-2025489, NNCI-1542101]
- Molecular Engineering & Sciences Institute
- Clean Energy Institute
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The research demonstrates the hybrid exciton-photon Fano resonance in two-dimensional Ruddleson-Popper perovskite films, explaining the mechanism behind this phenomenon through different models and simulation methods. The possibility of tuning Fano resonance by combining different structures is explored.
As easy-to-grow quantum wells with narrow excitonic features at room temperature, two-dimensional (2D) Ruddleson-Popper perovskites are promising for realizing novel nanophotonic devices based on exciton-photon interactions. Here, we demonstrate a distinct hybrid exciton-photon Fano resonance in (C4H9NH3)(2)PbI4 thin films prepared via spin coating. Using a classical coupled-oscillator model and finite-difference time-domain simulations, we link the Fano interference to the coupling of the exciton with the Rayleigh-like scattering of the film microstructure. Combining colloidal plasmonic cavities with the 2D perovskite films, we demonstrate tuning of the Fano resonance. In combination with silver nanoparticles, the exciton-photon Fano interference couples to the in-plane plasmonic modes with indications of Rabi splitting. By creating a nanoparticle on mirror geometry, we address the out-of-plane excitonic component, reaching an intermediate coupling regime. These structures suggest possible photonic targets for biomolecular self-assembly applications.
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