Bright magnetic dipole emission in Langmuir-Blodgett monolayers and its control with plasmonics

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.