Numerical analysis of thermally tunable liquid-crystal-filled terahertz fiber

Doudou Wang; Hongwei Ma; Lili Wang; Baihong Li; Jing Yang

doi:10.1117/12.2257112

28 February 2017 Numerical analysis of thermally tunable liquid-crystal-filled terahertz fiber

Doudou Wang, Hongwei Ma, Lili Wang, Baihong Li, Jing Yang

Author Affiliations +

Proceedings Volume 10256, Second International Conference on Photonics and Optical Engineering; 102561S (2017) https://doi.org/10.1117/12.2257112
Event: Second International Conference on Photonics and Optical Engineering, 2016, Xi'an, China

Abstract

A liquid-crystal-filled polymer photonic crystal fiber is designed and numerically analysised for terahertz wave guiding. Bandgap-guiding terahertz fiber is obtained by infiltrating the cladding air holes of index guiding Topas photonic crystal fiber with liquid crystal 5CB. Structural parameter dependence and thermal tunability of the photonic bandgaps, mode properties and confinement losses of the designed fiber are investigated by using the finite element method. The bandgaps are formed based on antiresonances of the individual liquid crystal inclusions, so the positions of bandgaps depend strongly on the cladding hole diameter and weakly on the lattice constant. Bandgaps and the positions of the confinement loss minimum or peaks of the transmission spectra shift toward lower frequency as temperature increased from 25 °C to 34 °C due to the positive dn_o/dT of 5CB. Average thermal tuning sensitivity of -30 GHz/°C is achieved for the designed fiber. At the central frequency of the transmission band, high power transmission coefficient and thus low splicing loss between the aligned liquid-crystal-filled polymer photonic crystal fiber and the unfilled section is obtained. Our results provide theoretical references for applications of liquid-crystal photonic crystal fiber in sensing and tunable fiber-optic devices in terahertz frequencies.

Citation Download Citation

Doudou Wang, Hongwei Ma, Lili Wang, Baihong Li, and Jing Yang "Numerical analysis of thermally tunable liquid-crystal-filled terahertz fiber", Proc. SPIE 10256, Second International Conference on Photonics and Optical Engineering, 102561S (28 February 2017); https://doi.org/10.1117/12.2257112

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KEYWORDS

Photonic crystal fibers

Liquid crystals

Polymers

Cladding

Finite element methods

Numerical analysis

Photonic crystal devices

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