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Sensors 2016, 16(12), 2205; doi:10.3390/s16122205

An Ultrasensitive Long-Period Fiber Grating-Based Refractive Index Sensor with Long Wavelengths

1
Key Biosensor Laboratory of Shandong Province, Biology Institute of Shandong Academy of Sciences, Jinan 250014, China
2
State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
3
CAS Key Laboratory of Bio-Medical Diagnostics, Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 23 September 2016 / Revised: 12 December 2016 / Accepted: 14 December 2016 / Published: 21 December 2016
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [2770 KB, uploaded 21 December 2016]   |  

Abstract

The response of a novel long-period fiber grating (LPFG) with a period of 180 µm to a surrounding refractive index (RI) was investigated. The results displayed that, with the increase in RI of the surrounding media of cladding glass in the grating region, the resonant peak located at 1336.4 nm in the transmission spectrum gradually shifts towards a shorter wavelength, while the resonant peak located at 1618 nm gradually shifted towards a longer wavelength. Moreover, the resonant peak at 1618 nm is much more sensitive to the surrounding RI than that of the one at 1336.4 nm. Compared with the conventional LPFG and other types of wavelength-interrogated RI sensors, such as ring resonators, surface plasmon resonance sensors, and Fabry–Perot interferometric sensors, this novel LPFG possesses a higher sensitivity, which achieved 10,792.45 nm/RIU (RI unit) over a RI range of 1.4436–1.4489. View Full-Text
Keywords: long-period fiber grating; refractive index; sensor; transmission spectrum; long wavelength long-period fiber grating; refractive index; sensor; transmission spectrum; long wavelength
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Li, Q.-S.; Zhang, X.-L.; Shi, J.-G.; Xiang, D.; Zheng, L.; Yang, Y.; Yang, J.-H.; Feng, D.; Dong, W.-F. An Ultrasensitive Long-Period Fiber Grating-Based Refractive Index Sensor with Long Wavelengths. Sensors 2016, 16, 2205.

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