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

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