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This example of a plasmonic waveguide filter shows that the waveguide rejects the electromagnetic radiation of the wavelength between 1.4 um and 1.6 um, but allows the rest of the wavelength. The silver material can be modeled using the Drude-Lorentz approximation, with ε∞ = 3.7, ωp = 13.8 rad/s, and γ = 2.736 rad/s; while the insulator is modeled using air. As an alternative to the Drude-Lorentz material model approximation, the material property determined by Johnson and Christy's experimental data can be used, which is available in the Material Library as Ag (Johnson).

Get details on how to model the plasmonic waveguide filter in the accompanying blog post: "How to Model Linear and Nonlinear Optics in the COMSOL^® Software"

Reference: Z. Han, E. Forsberg, and S. He, “Surface Plasmon Bragg Gratings Formed in Metal-Insulator-Metal Waveguides,” IEEE Photonics Technology Letters, vol. 19, no. 2, pp. 91–93, Jan. 15, 2007.