Fig. 2: Characterization of strong light-matter coupling.
From: Barrier-free reverse-intersystem crossing in organic molecules by strong light-matter coupling
a–d Angle dependent reflectance of Cavity1 (a), 2 (b), 3 (c), and 4 (d) with molecular energy levels (SFC = Frank-Condon state, T1 = Triplet state, and Ec = Cavity energy) and fitted polariton dispersions (P+ and P–), MC0 indicate the molecular contribution to P– at 0°. e–h Prompt (recorded at room temperature) and delayed (recorded at 77 K) emission spectra of a neat film (dashed black line), Cavity1 (e), 2 (f), 3 (g), and 4 (h). For Cavities 1–3 the polariton emission maxima moves to higher energies upon cooling. The blue shift is of the same magnitude (approximately 2 nm) and therefore attributed to a small contraction of the film when cooling. The emission maximum of phosphorescence from a neat film is indicated with a vertical gray dashed line in all graphs, and the energy of the lower polariton, as deduced from reflectivity measurements, is indicated with a vertical dashed line of corresponding color.
