A magnetically tunable non-Bragg defect mode in a corrugated waveguide filled with liquid crystals

作者：Zhang, Lu; Fan, Ya-Xian^*; Liu, Huan; Han, Xu; Lu, Wen-Qiang^*; Tao, Zhi-Yong^*

来源：Physics Letters, Section A: General, Atomic and Solid State Physics , 2018, 382(14): 1000-1005.

DOI：10.1016/j.physleta.2018.02.017

• Magnetic tunability
• Transverse modes
• Mode interactions
• Frequency manipulation

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.

• 出版日期2018-4-12
• 单位中国科学院重庆绿色智能技术研究院; 哈尔滨工程大学