Simultaneous omnidirectional zero-n¯ and zero-ϕeff non-Bragg gaps in metamaterial-polaritonic photonic superlattices

Present study shows that the inclusion of single negative polaritonic-like layers in one-dimensional metamaterial photonic superlattices may lead to new effects, such as the simultaneous existence of omnidirectional zero-n¯ and zero-ϕ(eff) non-Bragg gaps for both transversal electric (TE) and transversal magnetic (TM) polarizations, which are also robust to uniaxial anisotropic effects. Such omnidirectional behavior, in the case of the zero-n¯ gap, occurs within the same frequency range for both polarizations, which is not allowed in the case of double negative (DNG) metamaterial-air superlattices, suggesting a route to design and development of omnidirectional optical filters for all polarizations. Furthermore, present results show that, when polaritonic inclusions are considered, the long wavelength approximation is not ever suitable to describe the non-Bragg gap edges.