Multiple kinds of emission modes in semiconductor microcavity coupled with plasmon

The photoluminescence emission of the ZnO microcavity coupled with the plasmon has three kinds of modes: the emission modes in the band-edge emission band, the wide emission modes and the thin emission modes in the defect-related emission band. The emission modes in the band-edge emission band are the plasmon coupled exciton polariton with the effective refractive index of 2.04. The exciton coupling equation with the effective refractive index can describe the coupling between the exciton, plasmon and microcavity very well. The wide emission modes in the visible band are the plasmon coupled transverse Fabry-Perot modes with the effective refractive index of 1.84 at the wavelength of 580 nm (2.14 eV). The thin emission modes in the visible band are the plasmon coupled WGM with the effective refractive index of 1.87 at the wavelength of 566.1 nm (2.190 eV). Because of the phase difference of the two polarizations in the total internal reflections, doubled modes are observed for the WGM, which leads to the thin modes in the visible band.