In this work, we analyze filtering properties in a photonic crystal (PC) dual-channel tunable filter. The filter structure containing twin superconducting thin films is denoted as (1/2) M S 1 (2/1) N S 2 (1/2) M . Here, 1 and 2 are dielectrics of SrTiO 3 and Al 2 O 3 , respectively. S 1 and S 2 are two high-temperature superconducting thin films taken to be the typical system, YBa 2 Cu 3 O 7-x . The two channel frequencies can be designed to locate within the photonic band gap (PBG) of the original PC (1/2) M . Channel frequencies can be significantly changed by changing N, the stack number of the center PC. With the use of superconducting defects, channel frequencies are temperature-dependent, that is, the filter is thermally tunable. The proposed filter structure is of technical use in superconducting photonic applications at terahertz frequency.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics