Beschreibung:
We report on the investigation and observation of Bloch surface wave polaritons, resulting fromthe interaction between excitons in ZnO and a Bloch surface wave supported by a distributedBragg reflector (DBR), for temperatures up to 430 K. The samples were fabricated using pulsedlaser deposition and consist of a DBR made of 6.5 layer pairs of yttrica-stabilized zirconia andAl2O3 with a ZnO surface layer. We measured the reflectivity of transverse electric modes using aSiO2 prism in Kretschmann–Raether configuration, giving access to high in-plane momenta.Whereas the lower polariton branch was clearly observable, the upper polariton branch was notvisible, due to the strong absorption in ZnO above the excitonic resonance. By employing acoupled oscillator model for the interaction between the bare surface mode and exciton, wederived a corresponding Rabi splitting between 100–192 meV at 294 K, which decreases withincreasing temperature.