  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.
