  Plasmonic phenomena are exhibited in light-matter interaction involving
materials whose real parts of permittivity functions attain negative values at
operating wavelengths. However, such materials usually suffer from dissipative
losses, thus limiting the performance of plasmon-based optical devices. Here,
we utilize an alternative methodology that mimics a variety of plasmonic
phenomena by exploiting the well-known structural dispersion of electromagnetic
modes in bounded guided-wave structures filled with only materials with
positive permittivity. A key issue in design of such structures is prevention
of mode coupling, which can be achieved by implementing thin metallic wires at
proper interfaces. This method, which is more suitable for lower frequencies,
allows designers to employ conventional dielectrics and highly conductive
metals for which the loss is low at these frequencies, while achieving
plasmonic features. We demonstrate, numerically and analytically, that this
platform can provide surface plasmon polaritons, local plasmonic resonance,
plasmonic cloaking and epsilon-near-zero (ENZ)-based tunneling using
conventional positive-dielectric materials.
