Strong Light–Matter Interaction of Molecular Aggregates with Two Excitonic Transitions
R. Schäfer, Lukas Böhner, Manuela Schiek, Dirk Hertel, Klaus Meerholz, Klas Lindfors
Abstract
High Resolution Image Download MS PowerPoint Slide We demonstrate simultaneous strong light–matter coupling of J- and H-like transitions of molecular aggregates of a merocyanine dye placed in a planar microcavity. The molecules form a uniaxial crystal with the transition dipole moments of the two transitions oriented along and normal to the cavity mirrors. Both transitions are spectrally narrow, allowing one to reach the strong-coupling regime between the excitons and cavity photons of the 3λ/2- and 1λ modes of the cavity. Our work explores the strong light–matter coupling of H-transitions, which has so far not been properly studied. We show how the number of coherently coupled molecules in the molecular aggregates influences the strong-coupling allowing us to relate the degree of aggregation to the observed Rabi energy. Our polaritonic system forms a platform to study the photophysics of complex strong-coupling phenomena.