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Open AccessArticle

Guided-Mode-Leaky-Mode-Guided-Mode Fiber Interferometer and Its High Sensitivity Refractive Index Sensing Technology

1
College of Information Science and Engineering, Northeastern University, Shenyang 110819, China
2
State Key Laboratory of Synthetical Automation for Process Industries, Northeastern University, Shenyang 110819, China
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Sensors 2016, 16(6), 801; https://doi.org/10.3390/s16060801
Received: 8 March 2016 / Revised: 6 May 2016 / Accepted: 20 May 2016 / Published: 1 June 2016
(This article belongs to the Section Physical Sensors)
A cascaded symmetrical dual-taper Mach-Zehnder interferometer structure based on guided-mode and leaky-mode interference is proposed in this paper. Firstly, the interference spectrum characteristics of interferometer has been analyzed by the Finite Difference-Beam Propagation Method (FD-BPM). When the diameter of taper waist is 20 μm–30 μm, dual-taper length is 1 mm and taper distance is 4 cm–6 cm, the spectral contrast is higher, which is suitable for sensing. Secondly, experimental research on refractive index sensitivity is carried out. A refractive index sensitivity of 62.78 nm/RIU (refractive index unit) can achieved in the RI range of 1.3333–1.3792 (0%~25% NaCl solution), when the sensor structure parameters meet the following conditions: diameter of taper waist is 24 μm, dual-taper length is 837 μm and taper distance is 5.5 cm. The spectrum contrast is 0.8 and measurement resolution is 1.6 × 10−5 RIU. The simulation analysis is highly consistent with experimental results. Research shows that the sensor has promising application in low RI fields where high-precision measurement is required due to its high sensitivity and stability. View Full-Text
Keywords: optical fiber sensor; refractive index measurement; Micro-Nano fiber; Mach-Zehnder interferometer; high sensitivity optical fiber sensor; refractive index measurement; Micro-Nano fiber; Mach-Zehnder interferometer; high sensitivity
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MDPI and ACS Style

Wang, Q.; Li, C.; Zhao, C.; Li, W. Guided-Mode-Leaky-Mode-Guided-Mode Fiber Interferometer and Its High Sensitivity Refractive Index Sensing Technology. Sensors 2016, 16, 801.

AMA Style

Wang Q, Li C, Zhao C, Li W. Guided-Mode-Leaky-Mode-Guided-Mode Fiber Interferometer and Its High Sensitivity Refractive Index Sensing Technology. Sensors. 2016; 16(6):801.

Chicago/Turabian Style

Wang, Qi; Li, Chunyue; Zhao, Chengwu; Li, Weizheng. 2016. "Guided-Mode-Leaky-Mode-Guided-Mode Fiber Interferometer and Its High Sensitivity Refractive Index Sensing Technology" Sensors 16, no. 6: 801.

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Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

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