Abstract
The modes in a double-layer of single-negative material have been investigated. The conditions for the existence of different modes have been analyzed. The relations between different modes and material parameters are considered. Tunneling mode appears when the general zero average permittivity and permeability conditions are satisfied. When the wave guide condition is satisfied, electromagnetic wave is evanescent outside the material, and the field is mainly localized at the interface of the two single-negative layers.
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