Theory of supercoupling, squeezing wave energy, and field confinement in narrow channels and tight bends using ε near-zero metamaterials

By Mario G. Silveirinha, Nader Engheta. 2007

301 citations recorded by the source corpus.

In this work, we investigate the detailed theory of the supercoupling, anomalous tunneling effect, and field confinement originally identified by Silveirinha and Engheta [Phys. Rev. Lett. 97, 157403 (2006)], where we demonstrated the possibility of using materials with permittivity $\ensuremath{\epsilon}$ near zero to drastically improve the transmission of electromagnetic energy through a narrow irregular channel with very subwavelength transverse cross section. Here, we present additional physical insights, describe applications of the tunneling effect in relevant waveguide scenarios (e.g., the ``perfect'' or ``super'' waveguide coupling), and study the effect of metal losses in the metallic walls and the possibility of using near-zero $\ensuremath{\epsilon}$ materials to confine energy in a subwavelength cavity with gigantic field enhancement. In addition, we systematically study the propagation of electromagnetic waves through narrow channels filled with anisotropic near-zero $\ensuremath{\epsilon}$ materials. It is demonstrated that these materials may have interesting potentials, and that for some particular geometries, the reflectivity of the channel is independent of the specific dimensions or parameters of near-zero $\ensuremath{\epsilon}$ transition. We also describe several realistic metamaterial implementations of the studied problems, based on standard metallic waveguides, microstrip line configurations, and wire media.

Subfields: Aerospace Engineering, Biomedical Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/294674fb15f7a4555d5389cbf64a93ef43bf8377

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Citations in the corpus

A High Gain Antenna With an Optimized Metamaterial Inspired Superstrate (2012, unknown): “Such a feature can be exploited in various applications such as wave-tunneling through small cross-sections with irregular shapes [5]–[7], cloaking [8], and lenses [9].”
Epsilon-Near-Zero Al-Doped ZnO for Ultrafast Switching at Telecom Wavelengths: Outpacing the Traditional Amplitude-Bandwidth Trade-Off (2015, methodology): “To enhance the amplitude of the material response, we propose operating in the epsilon-near-zero (ENZ) regime [25,44–46].”