Monolayers with closely packed molecules of amphiphilic EuTTA deposited on plasmonic metal demonstrate bright luminescence in contrast with diluted systems and theoretical predictions of full quenching. In order to better understand the role of intermolecular interactions and surface plasmons, we study the spontaneous emission in EuTTA ultra-thin films in dielectric and plasmonic environment. The emission kinetics in systems with closely packed emitters strongly differs from that in diluted emitters. The kinetics and spectra are very sensitive to the environment. Using multilayered structures, we were able to enhance the magnetic to electric dipole transition branching ratio by more than order of magnitude.
We have studied dispersion of surface plasmon polaritons (SPPs) in the Kretcshmann’s geometry (prism/Ag/dye-doped polymer) in weak, intermediate, and ultra-strong exciton-plasmon coupling regimes. The dispersion curves obtained in the reflection experiment, were in a good agreement with the simple model predictions at small concentrations of dye (Rh590 and Rh610) in the polymer (PMMA). At the same time, a highly unusual multi-segment ladder-like dispersion curves were observed at extra-large dye concentrations. The dispersion curves observed in polymers co-doped with two dyes (Rh590 and Rh610) suggest strong coupling of excitons in the Kretchmann’s geometry. Acknowledgments: NSF 1856515, DOE/NNSA DE-NA0004007.
We have studied dispersion of surface plasmon polaritons (SPPs) in the Kretcshmann’s geometry (prism/Ag/dye-doped polymer) in weak and strong exciton-plasmon coupling regimes. In reflection, the dispersion curves were in a good agreement with simple model predictions at small concentrations of the dye (R6G) in the polymer (PMMA). At the same time, highly unusual multi-segment ladder-like dispersion curves were observed at large dye concentrations. To describe this behavior, we upgraded the theoretical model taking into account strong exciton-plasmon coupling. The dispersion curves obtained in emission experiments were strongly different from those in reflection and did not seem to be affected by the strong coupling.
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