Investigation of bandgap properties in one-dimensional binary superconductor–dielectric photonic crystal: TE case

A binary superconductor–dielectric photonic crystal (PC) is proposed. The PC has the structure (AB)N with layer A representing the superconducting layer and layer B the dielectric material. The transfer matrix technique is used to deduce the transmission coefficient through the PC. The properties of photonic bandgaps (PBGs) arising in the transmission spectra are studied with the angle of incidence and with all parameters of the superconductor such as thickness, London penetration length, and critical temperature. Many interesting findings were reached: The PBG width decreases with increasing the incidence angle until it disappears for high incidence angles. There is an optimum superconducting layer thickness at which the PBG shows a maximum. The critical temperature has the lowest effect on the PBG width among the superconductor parameters, whereas London penetration length has the topmost effect.