Fig. 2: Electronic strong coupling of Ce6T Q-band.
A The schematic illustration of ESC in an Al/Ce6T/Al Fabry-Perot cavity. B The cavity transmittance spectrum shows the splitting of the Ce6T Q-band (black dotted curve) under ESC and the formation of the polaritonic states, P+ and P− (red-shaded curve). C The emission spectrum of Ce6T (λex = 450 nm) under ESC (red curve) and in an off-resonance cavity (black curve). D Angle-resolved white light reflectance plots of strongly coupled Ce6T. The white solid curve shows the coupled oscillator fit of the polaritonic states. The blue dotted curve corresponds to the dispersion of the uncoupled cavity mode (ħωc), and the blue solid line represents the Ce6T Q-band energy (ħωm). E Angle-resolved emission plot of strongly coupled Ce6T. The white solid curve shows the coupled oscillator fit of the polaritonic states. The black solid and dashed lines show the monomer and the excimer-like emission maxima of the non-cavity Ce6T, respectively. To measure the dispersion, we prepared Fabry-Perot cavities using Ag mirrors. Additional spectral characterization of the Ag cavity is given in Supplementary Fig. 4. F Schematic representation of the Al/PVA/Ce6T/PVA/Al cavity. G The transmittance spectrum shows the splitting of the Ce6T Q-band (black dotted curve) under ESC and the formation of the polaritonic states (red-shaded curve) in an Al/PVA/Ce6T/PVA/Al cavity. H The emission spectra of Ce6T in Al/PVA/Ce6T/PVA/Al cavities under ESC (red curve) and off-resonance (black curve). The λex represents the excitation wavelength.
