The photonic band structures of body-centred-tetragonal crystals composed of ionic or metal spheres

Abstract

Abstract. The photonic band structures of body-centred-tetragonal (BCT) crystals composed of ionic or metal spheres are computed using the highly efficient vector-wave Korringa-KohnRostoker (KKR) method; an absolute band gap is found for the photonic crystals with high filling ratio. The band gap is smaller in the crystals composed of ionic spheres than in those composed of metal spheres. The particular BCT structure was chosen since such structure can be easily realized in an electrorheological fluid in the presence of an electric field.

Metallic photonic crystals with strong broadband absorption at optical frequencies over wide angular range

“…25,27,28 However, such flat bands appear in the band structure of three-dimensional metallic photonic crystals. 14,32 Thus, we expect that wide angle almost complete absorption will also be observed in such three-dimensional structures, if the crystal parameters are chosen based on the discussion above.…”

Bandgap generation and enhancement in polaritonic cylinder square-lattice photonic crystals

“…Among a variety of dispersive composite structures, there has been great interest in extensive study of ionic or polaritonic materials arranged in a periodic structure, socalled polaritonic photonic crystals (PPCs) [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. Compared to metallic systems, these types of structures provide stronger and sharper resonances [24].…”

“…There is some work on the calculation of band structures for different geometrical structures concerning 2D square and triangular lattices. They consist of polaritonic cylinders [12], a 2D square lattice of air cylinders embedded in an ionic crystal [13], a 2D hexagonal lattice of air cylinders in an ionic crystal [14], body-centered-tetragonal crystals composed of ionic spheres [15] and arrays of ionic spheres [16]. Moreover, the density of states and transmittance of the PPC finite slabs consisting of polaritonic spheres in a dielectric host medium and also the transmittance and absorbance of the PPC finite slabs containing two-and three-dimensional periodic structures of air cavities as well as band structure of corresponding infinite crystals have been studied [17,18].…”

Dispersion of Acoustic Phonons in Quasiperiodic Superlattices

“…[10][11][12] In recent years, with the technological development in nanostructure technology, finite-size sequences of two different materials can now be grown in the laboratory. 13 In fact, a wealth of literature has resulted from the extensive research on different properties of these systems over the past few years. Kohmoto et al 14 fabricated a one-dimensional quasiperiodic superlattice and studied the transmission of light through this superlattice structure.…”