We propose an asymmetric distribution of a hexagonal lattice for achieving near-zero group velocity with negative delay. This study reports the effect continuous geometric perturbation on photonic band diagram and consequently its impact phase velocity, effective refractive index. provide promising method modifying to obtain exotic dispersion diagram. With this broadband spanning from E L band,...

Recently, photonic band-gap (PBG) structures are under intense research due to their various applications in optics, microwave, and antenna engineering. Therefore, the accurate modelling of band diagram of frequency-dependent PBG structures is highly needed because the electric properties of all of the materials depend on frequency. In this paper, a new finite-difference frequency-domain (FDFD)...

The phase diagram of a vertex model introduced by P. Di Francesco (Nucl. Phys. B 525, 507 1998) representing the configurations of a square lattice which can fold with different bending energies along the main axes and the diagonals has been studied by Cluster Variation Method. A very rich structure with partially and completely folded phases, different disordered phases and a flat phase is fou...

Department of Chemistry, University of Cal CA 95616, USA. E-mail: [email protected] Chemical and Engineering Materials Divisi Ridge, Tennessee 37830, USA Laboratoire CRISMAT, ENSICAEN, CNRS U F-14050 Caen, France † Electronic supplementary information tables of crystal structure renements an CIFs, synchrotron X-ray and neutron p plots, additional TEM and elemental an structure diagrams. See D...

Recent advances in thin-film crystal-g:rowth techniques such as molecular-beam epitaxy (MBE) have enabled the fabrication of quantum-well devices, which consist of alternating layers of various crystalline solid materials so thin that the materials' combined quantum-mechanical properties override their individual bulk properties. By using MBE, we constructed a number of quantum-well devices tha...