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

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

2010-12-23

arxiv.org/abs/1012.5209v2

Physics

Optics

5 pages, 5 figures (minor revisions)

Scientific paper

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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