Improvement on refractive index sensing by exploiting the tapered two-mode fibers

被引：12
作者：
Fang, Fang [1 ,2 ]
Sun, Bing [1 ,2 ]
Zhang, Zuxing [1 ,2 ]
Xu, Jing [3 ]
Zhang, Lin [4 ]
机构：
[1] Nanjing Univ Posts & Telecommun, Coll Elect & Opt Engn, Adv Photon Technol Lab, Nanjing 210023, Jiangsu, Peoples R China
[2] Nanjing Univ Posts & Telecommun, Coll Microelect, Nanjing 210023, Jiangsu, Peoples R China
[3] Zhejiang Univ, Ocean Coll, Opt Commun Lab, Zhoushan 316021, Peoples R China
[4] Aston Univ, Aston Inst Photon Technol, Birmingham B4 7ET, W Midlands, England
来源：
CHINESE OPTICS LETTERS | 2019年 / 17卷 / 11期
基金：
中国博士后科学基金; 中国国家自然科学基金;
关键词：
PHOTONIC-CRYSTAL FIBER; OPTICAL-FIBERS; SENSOR; INTERFEROMETER; SENSITIVITY;
D O I：
10.3788/COL201917.110604
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The spectral characteristics and sensitivities of a tapered two-mode fiber sandwiched between two single-mode fibers are systematically investigated. Theoretical calculations reveal that a dispersion turning point (DTP) appears when the group effective refractive index (RI) difference between the fundamental mode and the higher-order mode equals zero; as a result, ultrahigh RI sensitivities can be achieved. Furthermore, the location of the DTP is strongly dependent on the tapering condition. Then, we experimentally demonstrate high sensitivities of the RI sensor with the waist diameter of similar to 4 mu m by means of immersing it in a flow cell filled with glycerol solution. In further tracking of the resonant wavelength shift around the DTP, it is found that the proposed RI sensor exhibits a sensitivity of 1.81 x 10(4) nm/RIU and a limit of detection down up to 3.29 x 10(-5) RIU in a liquid glycerol solution.
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页数：5
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