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We explore the dynamics of strong near field couplings between excitons of a J-aggregated squaraine thin film and surface plasmon polariton excitations using two-dimensional electronic spectra. Pronounced Rabi oscillations of their cross-peaks are resolved for the first time and provide conceptually new insight into the near-field couplings of the system. We show how radiative couplings govern the polariton nonlinearity and provide first access to the two-quantum- excitations of the coupled system.
Christoph Lienau
"Rabi oscillations in disguise: strong exciton-surface plasmon polariton coupling probed by two-dimensional electronic spectroscopy", Proc. SPIE PC12199, Physical Chemistry of Semiconductor Materials and Interfaces XXI, PC1219906 (3 October 2022); https://doi.org/10.1117/12.2633268
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Christoph Lienau, "Rabi oscillations in disguise: strong exciton-surface plasmon polariton coupling probed by two-dimensional electronic spectroscopy," Proc. SPIE PC12199, Physical Chemistry of Semiconductor Materials and Interfaces XXI, PC1219906 (3 October 2022); https://doi.org/10.1117/12.2633268