Abstract

We choose such a one-dimensional (1D) system of Wannier excitons, e.g., semiconductor quantum wires (QW's) or conjugated polymers whose length is several times larger than the wavelength of the relevant light within the medium composing the microcavity. The characteristic feature of this system may be stated as follows. The relevant excitation here is the lowest-energy exciton, since it has the dominant oscillator strength and a very large binding energy. Among the various interactions present, the largest is the exciton-radiation field coupling, which strongly hybridizes this exciton into an exciton polarition. Thus the longitudinal-transverse splitting of the exciton polarition is larger than the exciton-phonon interaction and the decay rate of the photon from the cavity. For simplicity, we neglect the inhomogeneous broadening and scattering of the polaritons at the interface in this paper and solve the population dynamics of polations taking account of the exciton-phonon scattering and the leakage of polaritons at the end of the cavity. Then reflecting the bosonic nature of polaritons, the polaritons dominantly occupy the specified single mode above the critical pumping rate. These condensed polaritons can radiate coherently.

© 1995 IEEE