Fig. 1: Overview of exciton-polariton transport model.

a Schematic of an organic microcavity filled with an ordered molecular ensemble in which all molecular TDMs \({\overrightarrow{\mu }}_{01}\) are aligned with the cavity polarization direction. b Static and dynamic disorder are included in the model by sampling the molecular electronic excitation energies \({\omega }_{m}^{\,{j}}\) from a Gaussian distribution P(ω), and by introducing vibronic coupling (characterized by κ), respectively. The latter results in nuclear motion in the excited electronic state. c Polariton dispersion curve ω_LP/UP(k_x) with bare molecular ω_m and bare cavity ω_cav dispersion. d Corresponding exciton content and e group velocities of lower and upper polariton branches. Colored circles in (c–e) mark the polaritonic states targeted through resonant excitation by an external laser pulse.