Effect of anisotropy on the photonic band gap and surface polaritons of a one-dimensional single-negative photonic crystal

The effect of anisotropy on the photonic band structure and surface polaritons of a one-dimensional photonic crystal made of uniaxially anisotropic epsilon-negative (ε<0,μ>0ε<0,μ>0) and mu-negative (ε>0,μ<0ε>0,μ<0) metamaterials is theoretically investigated. Two different cases of uniaxially anisotropic epsilon-negative and mu-negative metamaterials are considered. It is found out that for one case of anisotropy, one-dimensional photonic crystal does not have any single-negative band gap. As a result, it can not support the surface polaritons. While, for another case, the structure shows single-negative band gaps. So, the surface polaritons can be excited at the interface of such a photonic crystal. However, these surface polaritons, unlike the isotropic case, are not omnidirectional and they are restricted to a limited rang of the propagation constant.

► The effect of anisotropy on the PBG and SPs of single-negative 1D PCs is studied. ► The band structure of the 1D PC do not show any SNG PBG for one type of anisotropy. ► For other type of the anisotropy, there are SNG PBGs in the band structure. ► Unlike the isotropic 1D PC, the single-negative band gaps are not omnidirectional. ► The existence of the SPs at the interface is affected by the type of anisotropy.