Highly sensitive refractive index sensor based on cascaded microfiber knots with Vernier effect

被引：142
作者：
Xu, Zhilin [1 ]
Sun, Qizhen [1 ,2 ]
Li, Borui [1 ]
Luo, Yiyang [1 ]
Lu, Wengao [1 ]
Liu, Deming [1 ]
Shum, Perry Ping [1 ,3 ]
Zhang, Lin [2 ]
机构：
[1] Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Natl Engn Lab Next Generat Internet Access Syst, Wuhan 430074, Hubei, Peoples R China
[2] Aston Univ, Aston Inst Photon Technol, Birmingham B4 7ET, W Midlands, England
[3] Nanyang Technol Univ, Sch Elect & Elect Engn, OPTIMUS, Singapore 639798, Singapore
来源：
OPTICS EXPRESS | 2015年 / 23卷 / 05期
基金：
中国国家自然科学基金;
关键词：
MACH-ZEHNDER INTERFEROMETER; FABRY-PEROT-INTERFEROMETER; RING-RESONATORS; MAGNETIC-FIELD; OPTICAL SENSOR; STRAIN; NANOWIRES; GRATINGS;
D O I：
10.1364/OE.23.006662
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We propose and experimentally demonstrate a refractive index (RI) sensor based on cascaded microfiber knot resonators (CMKRs) with Vernier effect. Deriving from high proportional evanescent field of microfiber and spectrum magnification function of Vernier effect, the RI sensor shows high sensitivity as well as high detection resolution. By using the method named "Drawing-Knotting-Assembling (DKA)", a compact CMKRs is fabricated for experimental demonstration. With the assistance of Lorentz fitting algorithm on the transmission spectrum, sensitivity of 6523nm/RIU and detection resolution up to 1.533 x 10(-7)RIU are obtained in the experiment which show good agreement with the numerical simulation. The proposed all-fiber RI sensor with high sensitivity, compact size and low cost can be widely used for chemical and biological detection, as well as the electronic/magnetic field measurement. (C) 2015 Optical Society of America
引用
收藏
页码：6662 / 6672
页数：11
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