EXCITON-PHOTON COUPLING IN PHOTONIC WIRES

Cavity-polariton mode dispersion and exciton-photon coupling effects h ave been investigated by angle-resolved photoluminescence in a two dim ensionally confined semiconductor Bragg microcavity (photonic wires) w ith a quantum well (QW) inserted in the cavity layer. The lateral phot on confinement results in the appearance of additional photonic modes. The strong exciton-photon coupling leads to the formation of cavity p olaritons with energy-wave vector dispersion corresponding to the phot onic wires with ideal QW's (the coupling only between the photon and e xciton modes with the same lateral symmetry). The small influence of Q W potential fluctuations disturbing exciton lateral symmetry undoubted ly shows that the polaritons form via coherent collective exciton stat es.