Investigation on temperature controlling multifunctional selector in superconducting photonic crystals based on Thue-Morse sequence

In this paper, a novel one-dimensional superconducting photonic crystal exploiting the Thue-Morse arrangement is theoretically investigated by the transfer matrix method. Two transmission states are switched in utilization of ambient temperature in the case of the same structure in the terahertz regime: one is the omnidirectional photonic bandgap (OBG) characteristics in low-temperature zones (about 10 K), and the other is wide-angle broadband absorption characteristics in high-temperature zones (about 90 K). Due to the modulation of temperature-dependent superconducting complex permittivity, the proposed structure can induce the OBG and broadband absorption at different temperatures. From the numerical results, the OBG can be notably tuned by manipulating the structural parameter of high refractive index dielectric. The effects of superconducting thickness on the switchable function regions are also considered. The proposed structure can possess both environment stable zero-(n) over bar: OBG at 10 K and preeminent broadband absorption in the TM polarization at 90 K, which offers theoretical guidance to the design of temperature switchable function selectors. (C) 2020 Optical Society of America