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Comb-like modal dispersion diagram in a double wire medium slab

Silva, Solange Silva ; Morgado, T. A. ; Silveirinha, M. G.

IEEE Transactions on Antennas and Propagation Vol. -, Nº -, pp. 1 - 1, December, 2019.

ISSN (print): 0018-926X
ISSN (online): 0018-926X

Journal Impact Factor: 2,181 (in 2014)

Digital Object Identifier: 10.1109/TAP.2019.2950044

We investigate the guided modes supported by a wire metamaterial slab formed by two mutually orthogonal and nonconnected sets of parallel metallic wires. It is demonstrated that the wire medium slab has a peculiar comb-like dispersion diagram. In the continuum approximation, the metamaterial supports a diverging number of guided mode branches that accumulate near the light line due to a strong hyperbolic response in the static limit. In a realistic system, the number of guided modes branches is finite and is determined by the density of wires. Remarkably, the guided modes may be characterized by a fast field variation along the transverse direction, which can be exploited to detect subwavelength particles or defects.