Photoluminescence of photonic polaritons

In this paper, we study both experimentally and theoretically the photoluminescence PL properties of a monolithic organic based optical device constituted by two coupled MCs. The PL spectra from this coupled structure display two narrow peaks despite only one cavity b contains an active layer weakly coupled to the cavity mode. The presence of two peaks of comparable height in the emission spectrum originates from the coupling of the two cavities. These emission peaks arise from the photonic analog of cavity polaritons. Cavity polaritons result from quantum wells QW excitons strongly coupled to cavity photons. Polariton PL arises after the incoherent pumping of one subsystem QW excitons, detecting quanta from the other one escaping cavity photons. Analogously, in the present device, we can detect light PLa from the passive top cavity a while pumping the bottom cavity b by exciting the incoherent PL of the embedded active organic layer. However in contrast to the cavity polaritons, we can also pump and probe the same subsystem PLbthe bottom cavity with the embedded organic layer. By this way it is possible to achieve a more complete characterization of the strong coupling between two subsystems and a more complete test of the theoretical models. The study of the incoherent emission properties of cavity embedded quantum systems is also useful for understanding the emission properties of electroluminescent devices. In