Photonic band-structure and optical S-matrix analyses of the proposed   superconducting nanostructures
  Special optical structures composed of superconducting nanostructure based on the elemental type-II and layered high-Tc superconductors are proposed. The photonic band structure and the optical S-matrix are calculated for these proposed structures for different geometrical values. Such structures produce terahertz (THz) photonic band gap, which is controlled by the temperature and geometrical parameters. In addition, the proposed structures show controllable optical reflectance and transmittance in the considered terahertz range. The calculations are performed in a special frequency range in which the refractive index of the layered superconductors has negative value according to the previous analyses. 
Ali Sobhani Khakestar, Alireza Kokabi, Khashayar Mehrany, Mehdi   fardmanesh
physics.optics