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arXiv · 1012.5209

Electromagnetic tunneling through a single-negative slab paired with a double-positive bi-layer

Giuseppe Castaldi·Ilaria Gallina·Vincenzo Galdi·Andrea Alu'·Nader Engheta
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Abstract

We show that resonant tunneling of electromagnetic fields can occur through a three-layer structure composed of a single-negative (i.e., either negative-permittivity or negative-permeability) slab paired with bi-layer made of double-positive (i.e., positive permittivity and permeability) media. In particular, one of the two double-positive media can be chosen arbitrarily (even vacuum), while the other may exhibit extreme (either near-zero or very high) permittivity/permeability values. Our results on this counterintuitive tunneling phenomenon also demonstrate the possibility of synthesizing double-positive slabs that effectively exhibit single-negative-like wave-impedance properties within a moderately wide frequency range.

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Giuseppe Castaldi, Ilaria Gallina, Vincenzo Galdi, Andrea Alu', Nader Engheta. 2011-02-09. Electromagnetic tunneling through a single-negative slab paired with a double-positive bi-layer. https://doi.org/10.1103/physrevb.83.081105

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