Finite-element analysis of surface-plasmon modes for lossy optical waveguides by the use of perturbation techniques.
A finite-element analysis, with the aid of perturbation techniques, is used to determine the complex propagation characteristics of surface-plasmon modes that are supported by metal-dielectric interfaces. Symmetrical and nonsymmetrical three-layer optical waveguides incorporating a thin metal layer are studied, and the variations of the effective index and the attenuation constant with metal thicknesses are presented for both the short-range and long-range modes. Results are compared with previously published research, which was based on alternative approaches. Furthermore, for the first time to our knowledge, the complex propagation characteristics are presented for a coupled structure incorporating a surface-plasmon region with two-dimensional confinement.
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Themistos
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Rahman
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Grattan