“…Therefore, they have a great opportunity for application in tunable photonic crystals. Superconducting photonic crystals have illustrated some interesting properties like cutoff frequency [21], narrow transmission resonance [22,23], multichannel transmission [24][25][26], ultrawide band gap [27,28], omnidirectional band gap [29,30], polariton gap [31,32], terahertz radiation [33,34], giant magneto-optical effect [35], negative effective refractive index [36,37], nonlinear response [38], sharp Brewster type transparent window in transmission and reflectance spectra [39], and tunable Fano resonance [40].…”