Investigation of optical properties in near-zero-permittivity operation range for a superconducting photonic crystal

Optical properties of a periodic multilayer structure containing the superconducting and dielectric materials are theoretically investigated based on the Abeles theory for a stratified medium and the two-fluid model for a superconductor. It is found that, for the TM wave, at wavelength near the superconducting threshold wavelength, an additional high-reflectance band appears and some reflection dips exist, which are, however, not seen for the TE wave. The reflection dips behave as the strongly localized passbands that can be used to design a multichannel narrowband transmission filter without physically introducing any defect layer in the structure.