| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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A Novel Mach–Zehnder Interferometer Based on Hybrid Liquid Crystal–Photonic Crystal Fiber |
| Xian-Ping Luo1, Fei-Ru Wang1, Chun-Lei Chen1, Ling-Li Zhang2, Lei Wang1, Wei-Min Sun1, Yong-Jun Liu1** |
1Key Lab of In-fiber Integrated Optics (Ministry of Education), Harbin Engineering University, Harbin 150001
2Department of Physics, Harbin Institute of Technology, Harbin 150001
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| Cite this article: |
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Xian-Ping Luo, Fei-Ru Wang, Chun-Lei Chen et al 2017 Chin. Phys. Lett. 34 124203 |
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Abstract We propose a novel all fiber Mach–Zehnder interferometer (MZI) based on photonic crystal fiber (PCF) filled with liquid crystal (LC). The interference between the core mode and the cladding modes of a PCF is utilized. To excite the cladding modes, a region is formed using fiber fusion splicer. Due to the fact that varying effective index difference between the core region and the LC-filled cladding region can cause different transmission spectra, we mainly study the MZIs with different LC-filled structures and different lengths of LC filling. The measured results demonstrate that quite clear interference spectra can be obtained. Through analysis spatial frequency spectrum and temperature spectrum of two MZIs with different LC-filled structures, we can obtain that the MZI with adjacent two LC-filled holes has clearer interference spectrum and higher temperature sensitivity. Thus we choose this MZI to measure the temperature sensitivity with different lengths of LC filling. When the length of LC filling is 2 cm, the temperature sensitivities can be enlarged to 1.59 nm/$^{\circ}\!$C. The interferometer shows a good temperature tunability and sensitivity, which can be a good candidate for a highly tunable optical filtering and temperature sensing applications.
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Received: 11 October 2017
Published: 24 November 2017
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| Fund: Supported by the National Natural Science Foundation of China under Grant Nos U1531102, 61107059, 61308052 and U1331114, the 111 Project to the Harbin Engineering University under Grant No B13015, and the Fundamental Research Funds for the Central Universities. |
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