Optical harmonic generation on the exciton-polariton in ZnSe

Nonlinear Optical Response of the GaAs Exciton Polariton

High-resolution differential optical transmission measurements of a thin layer of bulk GaAs show anomalous behavior of the lowest energy exciton at low excitation density and temperature. The spectrum shows induced absorption with a superlinear dependence on excitation density with no detectable change in resonance frequency or linewidth. At a temperature dependent excitation density, the anoma...

Exciton-polariton mediated superconductivity.

We revisit the exciton mechanism of superconductivity in the framework of microcavity physics, replacing virtual excitons as a binding agent of Cooper pairs by excitations of an exciton-polariton Bose-Einstein condensate. We consider a model microcavity where a quantum well with a two-dimensional electron gas is sandwiched between two undoped quantum wells, where a polariton condensate is forme...

Exciton-polariton emission from organic semiconductor optical waveguides

We photoexcite slab polymer waveguides doped with J-aggregating dye molecules and measure the leaky emission from strongly coupled waveguide exciton polariton modes at room temperature. We show that the momentum of the waveguide exciton polaritons can be controlled by modifying the thickness of the excitonic waveguide. Nonresonantly pumped excitons in the slab excitonic waveguide decay into tra...

Exciton dephasing in ZnSe quantum wires

Exciton-Polariton Bose-Einstein Condensates

Exciton-polaritons, mixed light-matter quasiparticles in semiconductors, have recently shown evidence for Bose-Einstein condensation. Some of the properties of condensates of exciton-polaritons are reviewed in this article. We first discuss the spontaneous appearance of long-range order and the way this can be easily accessed in the case of polariton fluids. We show that the Penrose-Onsager cri...