Analysis of transmission properties in a photonic quantum well containing superconducting materials

Properties of wave transmission in a photonic quantum well (PQW) structure containing superconducting materials are theoretically investigated. We consider two possible PQW structures, (AB)^P(CD)^Q(AB)^P-asymmetric and (AB)^P(CD)^Q(BA)^P-symmetric, where the host photonic crystal (PC) (AB)^P is made of dielectrics, A = SrTiO₃t;, B = Al₂t;O₃t;, and the PQW (CD)^Q contains C = A and superconducting layer D = YBa₂t;Cu₃t;O₇-x, a typical high-temperature superconducting thin film. Multiple transmission peaks can be seen within the photonic band gap (PBG) of (AB)^P and the number of peaks is directly determined by the stack number of PQW, i.e., it equals Q-1. Additionally, the results show that symmetric PQW structure is preferable to the design of a multichannel transmission filter. The effect of stack number of photonic barrier is also illustrated. Such a filter operating at terahertz with feature of multiple channels is of technical use in superconducting optoelectronic applications.