Low-frequency spectroscopy of superconducting photonic crystals

Transmission, reflection and absorption of electromagnetic radiation and photon dispersion law for 2D photonic crystals with superconducting elements are studied. The calculation of the optical properties of photonic crystals is performed by layer-by-layer Korringa-Kohn-Rostoker techniques. The results of numerical calculations carried out for an array of superconducting cylinders have been understood in terms of a simple analytical model. The controlling of the optical properties of superconducting photonic crystal by temperature and magnetic fields is discussed. The variation of superconducting component density with temperature leads, particularly, to significant reduction of the transmission peaks and even to a non-monotonic behavior of some absorbance peaks.