Abstract
Surface-plasmon resonance is examined for a periodic semi-infinite structure with metal-dielectric unit cells in slab geometry. Electromagnetic waves through this structure are analyzed for the frequencies close to but smaller than the metal's plasma frequency. A distinguished limit is found to exist for a small metallic content along with a small metallic nature. As a result, even this narrow frequency interval reveals remarkable resonance characters including wave stability and group velocity dispersion, depending on the dielectric-constant contrast. Both the cut-off period and large-period behavior predicted in the absence of metal's material damping are found to be appreciably altered when considering material damping, which can be interpreted in terms of the resonant tunneling associated with structural periodicity and the depthwise energy exchange among multilayers.
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