A magnetically tunable non-Bragg defect mode in a corrugated waveguide filled with liquid crystals |
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| Authors: | Lu Zhang Ya-Xian Fan Huan Liu Xu Han Wen-Qiang Lu Zhi-Yong Tao |
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| Institution: | 1. Key Laboratory of In-Fiber Integrated Optics, Ministry of Education of China, Harbin Engineering University, Harbin 150001, People''s Republic of China;2. Physics Research Center, College of Science, Harbin Engineering University, Harbin 150001, People''s Republic of China;3. Key Laboratory of Multi-scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, People''s Republic of China |
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| Abstract: | A magnetically tunable, non-Bragg defect mode (NBDM) was created in the terahertz frequency range by inserting a defect in the middle of a periodically corrugated waveguide filled with liquid crystals (LCs). In the periodic waveguide, non-Bragg gaps beyond the Bragg ones, which appear in the transmission spectra, are created by different transverse mode resonances. The transmission spectra of the waveguide containing a defect showed that a defect mode was present inside the non-Bragg gap. The NBDM has quite different features compared to the Bragg defect mode, which includes more complex, high-order guided wave modes. In our study, we filled the corrugated waveguide with LCs to realize the tunability of the NBDM. The simulated results showed that the NBDM in a corrugated waveguide filled with LCs can be used in filters, sensors, switches, and other terahertz integrated devices. |
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| Keywords: | Magnetic tunability Transverse modes Mode interactions Frequency manipulation |
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