Filtering Properties of Photonic Crystal Dual-Channel Tunable Filter Containing Superconducting Defects |
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| Authors: | Jia-Wei Liu Tsung-Wen Chang Chien-Jang Wu |
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| Affiliation: | 1. Institute of Electro-Optical Science and Technology, National Taiwan Normal University, Taipei, 116, Taiwan
2. Graduate Institute of Electro-Optical Engineering, Chang Gung University, Tao-Yuan, 333, Taiwan
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| Abstract: | 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 S1(2/1) N S2(1/2) M . Here, 1 and 2 are dielectrics of SrTiO3 and Al2O3, respectively. S1 and S2 are two high-temperature superconducting thin films taken to be the typical system, YBa2Cu3O7?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. |
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