INTERFACE PLASMON EXCITATIONS OF SUPERLATTICES WITH DEFECTS

Interface plasmon excitations of superlattices with defects are invest igated by the propagation matrix method. A dispersion relation is obta ined and is shown to be of sufficient generality. The dispersion curve s of the local modes are shown to be dependent upon the thickness and the dielectric constant of the defect layer. The obtained formula gene ralizes some earlier results obtained by other authors. Several specia l cases, including the limiting cases of quantum-well layered structur es, are discussed and a new mode similar to the Giuliani and Quinn typ e mode is deduced.