Theory of Polariton-Mediated Photophysics in J Aggregates

Localization and delocalization are the centers of many photophysical phenomena. In general, the disorders in the molecular aggregates lead to exciton localization. However, when the molecular aggregates are coupled to a plasmonic cavity, the strong coupling between the molecular exciton and cavity photon could lead to the delocalized hybrid light-matter states, i.e., exciton-polaritons. Hence, there is competition between disorder-induced localization and polariton-induced delocalization, enabling new photophysical dynamics. In this talk, I will present our recent work on understanding the disorder effect in the formation of exciton-polaritons in J aggregated and polariton/disorder-induced photophysical dynamics via multiscale and multiphysics modeling.