Tuning the Coherent Propagation of Organic Exciton-Polaritons through Dark State Delocalization.

ABSTRACT: While there have been numerous reports of long-range polariton transport at room-temperature in organic cavities, the spatiotemporal evolution of the propagation is scarcely reported, particularly in the initial coherent sub-ps regime, where photon and exciton wavefunctions are inextricably mixed. Hence the detailed process of coherent organic exciton-polariton transport and, in particular, the role of dark states has remained poorly understood. Here, femtosecond transient absorption microscopy is used to directly image coherent polariton motion in microcavities of varying quality factor. The transport is found to be well-described by a model of band-like propagation of an initially Gaussian distribution of exciton-polaritons in real space. The velocity of the polaritons reaches values of

SUBMITTER: Pandya R 

PROVIDER: S-EPMC9218652 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature