The characteristics of photonic band gaps for three-dimensional unmagnetized dielectric plasma photonic crystals with simple-cubic lattice

In this paper, the characteristics of photonic band gaps (PBGs) for two types of three-dimensional unmagnetized dielectric plasma photonic crystals (PPCs) with simple-cubic lattices are theoretically studied based on a modified plane wave expansion (PWE) method. The first type (type-1) is a three-dimensional PPCs which dielectric spheres are arranged in the plasma background periodically with simple-cubic lattice, while the second one (type-2) is a complementary structure composed of plasma spheres in the dielectric background. Theoretical derivation of band structure of type-2 structure has been induced. We present the evolution of the locations and the midgap ratios of first two PBGs for two types of PPCs as functions of plasma frequency, filling factor, the relative dielectric constant and plasma collision frequency, respectively. The results show that not only the locations but also midgap ratios and bandwidths of first two PBGs for two types of PPCs can be tuned by plasma frequency, filling factor and the relative dielectric constant, respectively. However, the plasma collision frequency has no effect on the frequency ranges and midgap ratios of the first two PBGs for two types of PPCs.