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We show that obliquely-incident, transversely-magnetic-polarized plane wavescan be totally transmitted (with zero reflection) through epsilon-near-zero(ENZ) bi-layers characterized by balanced loss and gain with parity-time (PT)symmetry. This tunneling phenomenon is mediated by the excitation of asurface-wave localized at the interface separating the loss and gain regions.We determine the parameter configurations for which the phenomenon may occurand, in particular, the relationship between the incidence direction and theelectrical thickness. We show that, below a critical threshold of gain andloss, there always exists a tunneling angle which, for moderately thick(wavelength-sized) structures, approaches a critical value dictated by thesurface-wave phase-matching condition. We also investigate the unidirectionalcharacter of the tunneling phenomenon, as well as the possible onset ofspontaneous symmetry breaking, typical of PT-symmetric systems. Our resultsconstitute an interesting example of a PT-symmetry-induced tunnelingphenomenon, and may open up intriguing venues in the applications of ENZmaterials featuring loss and gain.

Tunneling of Obliquely-Incident Waves through PT-Symmetric Epsilon-Near-Zero Bi-Layers