Waveguiding without a waveguide : Local-mode exciton polaritons in multiple quantum wells

Exciton polaritons are considered in infinite multiple quantum wells which are periodic except that one well~impurity! has a different well width from the others ~host!. Under certain circumstances it is possible to have a long-lived exciton-polariton mode localized about the impurity. From the viewpoint of the electromagnetic field, this corresponds to… CONTINUE READING