Electrically Tunable Propagation Properties of the Liquid Crystal-Filled Terahertz Fiber

A bandgap-guiding microstructured fiber for terahertz (THz) radiation was designed by infiltrating the cladding air holes with nematic liquid crystal. Structural parameter dependence of the photonic bandgaps, polarization-dependent bandgap splitting, and electrically tunable propagation properties o...

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Bibliographic Details
Published in:Applied sciences 2018-12, Vol.8 (12), p.2487
Main Authors: Wang, Doudou, Mu, Changlong, Li, Baihong, Yang, Jing
Format: Article
Language:English
Subjects:
Cladding
Design
electrical tunability
finite-element method
Frequency ranges
Insertion loss
liquid crystal
Liquid crystals
microstructured optical fiber
photonic bandgap
Polymers
Propagation
Propagation modes
Radiation
terahertz
Terahertz frequencies
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Summary:A bandgap-guiding microstructured fiber for terahertz (THz) radiation was designed by infiltrating the cladding air holes with nematic liquid crystal. Structural parameter dependence of the photonic bandgaps, polarization-dependent bandgap splitting, and electrically tunable propagation properties of the designed fiber were investigated theoretically by using the finite-element method. An external electric field applied across the designed fiber can broaden the effective transmission bandwidth and achieve single-mode single-polarization guidance. Flattened near-zero group-velocity dispersion of 0 ± 1 ps/THz/cm was obtained for the y-polarized fundamental mode within a broad frequency range. Our results provide theoretical references for applications of liquid crystal-filled microstructured fiber for dynamic polarization control and tunable fiber devices in THz frequency.
ISSN:2076-3417
2076-3417
DOI:10.3390/app8122487