Exciton-photon coupling in a ZnSe-based microcavity fabricated using epitaxial liftoff

摘要

We report the observation of strong exciton-photon coupling in a ZnSe-based microcavity fabricated using epitaxial liftoff. Molecular beam epitaxial grown ZnSe/Zn_(0.9)Cd_(0.1)Se quantum wells with a one wavelength optical length at the exciton emission were transferred to a SiO_2/Ta_2O_5 mirror with a reflectance of 96% to form finesse matched microcavities. Analysis of our angle-resolved transmission spectra reveals key features of the strong coupling regime: anticrossing with a normal mode splitting of 23.6 meV at 20 K, composite evolution of the lower and upper polaritons and narrowing of the lower polariton linewidth near resonance. The heavy-hole exciton oscillator strength per quantum well is also deduced to be 1.78 × 10~(13) cm~(-2).