High-Sensitivity Refractive Index Sensing Based on an SNPNS Composite Structure

被引：0
作者：
Wu, Di [1 ]
Zhou, Jingwen [2 ]
Yu, Xiang [1 ]
Sun, Yue [3 ,4 ]
机构：
[1] Zhejiang Inst Mech & Elect Engn, Hangzhou 310053, Peoples R China
[2] Tianjin Univ, Sch Marine Sci & Technol, Tianjin 300072, Peoples R China
[3] Tianjin Univ, Sch Precis Instruments & Optoelect Engn, Tianjin 300072, Peoples R China
[4] Tianjin Univ, Key Lab Optoelect Informat Sci & Technol, Minist Educ, Tianjin 300072, Peoples R China
来源：
PHOTONICS | 2024年 / 11卷 / 10期
关键词：
refractive index sensor; Mach-Zehnder interferometer; no-core fiber; photonic crystal fiber; MACH-ZEHNDER INTERFEROMETER; FIBER; SENSOR;
D O I：
10.3390/photonics11100941
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
In this paper, we design and demonstrate an all-fiber-sensitive refractive index (RI) sensor based on the Mach-Zehnder interferometer (MZI). It is constructed by splicing two no-core fibers (NCFs) and a photonic crystal fiber (PCF) between two single-mode fibers (SMFs) to obtain an SMF-NCF-PCF-NCF-SMF composite structure (SNPNS). A study of the effect of varying PCF lengths on the RI reveals that the shorter the length, the higher the sensitivity. The maximum RI sensitivity of 176.9 nm/RIU is attained within the RI range of 1.3365-1.3767 when the PCF length in the SNPNS structure is 3 cm. Meanwhile, the sensor exhibits a high stability in water, with an RSD of only 0.0019% for the interference trough over a duration of two hours. This proposed sensing structure offers the advantages of a large extinction ratio, small size, low temperature sensitivity, and simple fabrication, exhibiting a great potential in RI measurements.
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页数：11
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