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

被引：22

作者：

Li, Qiu-Shun ^{[1
]}

Zhang, Xu-Lin ^{[2
]}

Shi, Jian-Guo ^{[1
]}

Xiang, Dong ^{[3
]}

Zheng, Lan ^{[1
]}

Yang, Yan ^{[1
]}

Yang, Jun-Hui ^{[1
]}

Feng, Dong ^{[1
]}

Dong, Wen-Fei ^{[3
]}

机构：

[1] Shandong Acad Sci, Inst Biol, Key Biosensor Lab Shandong Prov, Jinan 250014, Peoples R China

[2] Jilin Univ, Coll Elect Sci & Engn, State Key Lab Integrated Optoelect, Changchun 130012, Peoples R China

[3] Chinese Acad Sci, Suzhou Inst Biomed Engn & Technol, CAS Key Lab Biomed Diagnost, Suzhou 215163, Peoples R China

来源：

SENSORS | 2016年 / 16卷 / 12期

基金：

中国国家自然科学基金;

关键词：

long-period fiber grating; refractive index; sensor; transmission spectrum; long wavelength; SENSITIVITY; BIOSENSOR;

D O I：

10.3390/s16122205

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The response of a novel long-period fiber grating (LPFG) with a period of 180 mu m 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.

引用

页数：9

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