Systematic surface waves analysis at the interfaces of composite DNG/SNG media.
The efficient analysis of practical metamaterial slabs, formed by networks of diverse split-ring resonators, is presented in this paper, concerning their competence to guide surface waves. Dispersion curves of the supported modes are consistently derived through closed-form expressions with average constitutive parameters of the slab's medium, estimated in terms of finite difference time domain (FDTD) simulations of the metamaterial's unit cell. Then, the resonant frequencies in the first Brillouin zone are computed via a rigorous FDTD model of the structure's unit cell and results are elaborately collated with their theoretical counterparts. The comparison reveals the lack of the analytical method to provide relatively correct outcomes for high Bloch numbers due to the nonlocal phenomena which become dominant near the Brillouin zone edge.
Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki, Thessaloniki, Greece.
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Sounas
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Kantartzis