title: Band-gap engineering in two-dimensional semiconductor-dielectric photonic crystals.
abstract: This paper reports the multiple band gaps in the two-dimensional semiconductor-dielectric photonic crystals of several compositions: semiconductor cylinders in the dielectric background. We consider both square lattice and hexagonal lattice arrangements and compute extensive band structures using a plane-wave method within the framework of an efficient standard eigenvalue problem for both E and H polarizations. The whole range of filling fraction has been explored to claim the existence of the lowest (the so-called acoustic) band gap and multiple higher-energy band gaps within the first 30 to 40 bands for various compositions. Such semiconductor-dielectric photonic crystals which are shown to possess huge lowest band gaps below a threshold frequency (the plasma frequency omega(p) ) have an advantage over the dielectric photonic crystals in the emerging technology based on the photonic crystals.
authors.affiliation: Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-Ku, Tokyo 153-8505, Japan.
authors.forename: M S
authors.initials: MS
authors.lastname: Kushwaha
authors.forename: G
authors.initials: G
authors.lastname: Martinez