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)MS1(2/1)NS2(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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Acknowledgements
C.-J. Wu acknowledges the financial support from the National Science Council of the Republic of China (Taiwan) under Contract No. NSC-100-2112-M-003-005-MY3 and from the National Taiwan Normal University under NTNU100-D-01.
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Liu, JW., Chang, TW. & Wu, CJ. Filtering Properties of Photonic Crystal Dual-Channel Tunable Filter Containing Superconducting Defects. J Supercond Nov Magn 27, 67–72 (2014). https://doi.org/10.1007/s10948-013-2259-4
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DOI: https://doi.org/10.1007/s10948-013-2259-4