Manipulating the transmission through valve structure composed of zero-index metamaterial

We propose a valve structure composed of zero-index metamaterial to manipulate the electromagnetic wave conveniently and effectively through regulating the phase of reflected waves. Both the structure and characteristics of zero-index metamaterial need not to be changed when manipulating the transmission, which maintains the stability of zero-index metamaterial. Moreover, the good performance of tuning the electromagnetic wave is not limited by the shape and size of our proposed structure. By using our proposed valve structure, we demonstrate the realization of the tunable curved anisotropic ε -near-zero material waveguide with irregular shape, arbitrarily sized isotropic ε -near-zero material waveguide with high transmittance and the curved isotropic impedance matched ε -near-zero material waveguide without polarization limitations. (paper)