The tunneling mode in the photonic heterostructure consisting of single-negative materials

The bilayer structure and the photonic crystals heterostructure consisting of epsiv-negative (ENG) and mu-negative (MNG) materials are successfully fabricated by using transmission line approach. We experimentally investigate the tunneling properties of them by the simulated and measured scattering parameters and phaseshifts. The results show that the heterostructure posses zero-phase-delay tunneling mode under the condition ofepsivmacr = 0 and mumacr = 0 , the characteristics are important for some engineering applications such as filters.