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Experimental Verification Of Epsilon-Near-Zero Metamaterial Coupling And Energy Squeezing Using A Microwave Waveguide, Brian Edwards, Andrea Alù, Michael Young, Mário Silveirinha, Nader Engheta

Nader Engheta

Utilizing a microwave setup, we experimentally verify our recently developed theory of energy squeezing and tunneling [Phys. Rev. Lett. 97, 157403 (2006)] 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.