title: Experimental verification of epsilon-near-zero metamaterial coupling and energy squeezing using a microwave waveguide.
abstract: Utilizing a microwave setup, we experimentally verify our recently developed theory of energy squeezing and tunneling [Phys. Rev. Lett. 97, 157403 (2006)10.1103/PhysRevLett.97.157403] through an ultranarrow waveguide channel that mimics zero-permittivity properties. Exploiting the infinite phase velocity supported by a waveguide transition section at cutoff, we test our theory of tunneling in this zero-permittivity region without use of resonant inclusions. This "supercoupling" is shown to have unique anomalous properties: an almost uniform phase along the narrow channel and weak dependence over its geometry.
authors.affiliation: Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA.
authors.forename: Brian
authors.initials: B
authors.lastname: Edwards
authors.forename: Andrea
authors.initials: A
authors.lastname: Alù
authors.forename: Michael E
authors.initials: ME
authors.lastname: Young
authors.forename: Mário
authors.initials: M
authors.lastname: Silveirinha
authors.forename: Nader
authors.initials: N
authors.lastname: Engheta