Enhanced the omnidirectional photonic band gaps in two-dimensional plasma photonic crystals

Abstract

In this paper, the properties of omnidirectional photonic band gaps (OBGs) in two-dimensional plasma photonic crystals (2D PPCs) for two novel configurations with triangular lattices are theoretically investigated by the modified plane wave expansion method in detail as the off-plane incident wave vector is considered, which are composed of the nomagnetized plasma cylinders inserted into the homogeneous and isotropic dielectric background. The computed results reveal that the proposed two new configurations have the advantage of obtaining the larger OBGs compared to the conventional configuration because the symmetry of 2D PPCs is broken by periodically inserted different sizes of plasma cylinders or connected the embedded plasma cylinders with thin veins. The analysis results show that the bandwidths of OBGs can be tuned obviously by changing geometric parameters of such two PCs structures. Those theoretical results may open a new scope to design the omnidirectional reflector or mirror based on the 2D PPCs.