TE-polarized surface plasmon polaritons in metal waveguides bounded by self-focusing and self-defocusing media.
We have examined the dispersion relations for TE-polarized surface plasmon polaritons that are guided by a metal film bounded by a semi-infinite self-defocusing medium on one side and a self-focusing medium on the other. Depending on the material parameters, the TE-polarized waves exhibit a definite power threshold and a limited range of propagation constants. For a given metal dielectric constant, there exists a maximum film thickness and a minimum refractive index of the defocusing medium above and below which, respectively, the mode does not exist.
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Subramaniam