Study of the properties of 2D photonic crystal structures as a function of the air-filling fraction and refractive index contrast

► We have numerically studied in-plane wave propagation in two-dimensional photonic crystals. ► Photonic crystal bandgap reflectivity and width can be optimized at midrange air-filling fractions. ► Photonic crystal band gap reflectivity and width can be optimized at midrange air-filling fractions.