Coupled Surface Electromagnetic Waves Supported by Subwavelength Nano Conducting Layers

Recently, a group of novel devices based on conducting interfaces has been proposed. These conducting interfaces can be implemented by using the inversion layer of MOS structures, trapped charges or depletion layer charges. It has been shown that these structures can support surface electromagnetic waves. In this paper, the coupling of surface electromagnetic waves supported by nano charge layers is analyzed and its asymptotic behavior toward conducting interfaces, where the thin charge layer of finite thickness is modeled via a surface conductivity sigma_s, is numerically studied for the first time. The numerical results driven by coupled mode theory approach are justified by solving exact transcendental dispersion equation derived from exact electromagnetic analysis.