Cavity enhanced single photon emission from bound excitons in ZnSe

Chlorine delta-doped ZnSe quantum wells have been shown to be a good platform for single photon emission from impurity bound excitons. The fabrication of nanostructures provides a way to couple single photons into an optical cavity to realize faster single photon sources and spin-photon interfaces. Here we propose, simulate and experimentally demonstrate enhanced single photon emission by coupling bound exciton emission with a bullseye cavity resonance, which have been used to demonstrate large improvements in brightness and collection efficiency. In the Finite difference time domain (FDTD) simulation, the optical system shows Purcell enhancement and directional far field radiation. In the experiment, we observed significantly enhanced brightness of single photons from bound excitons in the cavity compared against bound excitons out of the cavity area. The photon decay rates of bound excitons inside and outside of the cavity area are analyzed by a time-resolved PL measurement.