Investigation of the effect of noncircular scatterers on the band structure of anisotropic photonic crystal slabs

Abstract

Using the supercell approach based on the plane wave expansion method, we analyze the photonic bandgap (PBG) of square and triangular photonic crystal slabs composed of air holes in an anisotropic tellurium background with SiO(2) as cladding material. Two shapes (square and hexagonal) are considered for air holes. We discuss the maximization of the full PBG width as a function of noncircular air hole parameters, their orientation, and also slab thickness. The numerical results show that both structures represent a full PBG with noticeable width, which can be helpful for designing optical devices.