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

Abstract

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${}_2$O${}_5$ 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 $23.6meV$ at $20K$; 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 $1.78\times 10^{13}c{m}^{-2}$.

3 pages, 3 figures