Refractive index sensor using microfiber-based Mach-Zehnder interferometer

被引：175

作者：

Wo, Jianghai ^{[1
,2
,3
]}

Wang, Guanghui ^{[3
]}

Cui, Ying ^{[3
]}

Sun, Qizhen ^{[1
,2
]}

Liang, Ruibing ^{[1
,2
]}

Shum, Perry Ping ^{[1
,3
]}

Liu, Deming ^{[1
,2
]}

机构：

[1] Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, Coll Optoelect Sci & Engn, Wuhan 430074, Peoples R China

[2] Natl Engn Lab Next Generat Internet Access Syst, Wuhan 430074, Hubei, Peoples R China

[3] Nanyang Technol Univ, Sch Elect & Elect Engn, Singapore 639798, Singapore

来源：

OPTICS LETTERS | 2012年 / 37卷 / 01期

基金：

中国国家自然科学基金;

关键词：

SUBWAVELENGTH-DIAMETER SILICA; OPTICAL MICROFIBERS; EVANESCENT FIELD; WAVE-GUIDES; FIBER; MODE;

D O I：

10.1364/OL.37.000067

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A simple and robust refractive index (RI) sensor based on a Mach-Zehnder interferometer has been demonstrated. A section of optical microfiber drawn from silica fiber is employed as the sensing arm. Because of the evanescent field, a slight change of the ambient RI will lead to the variation of the microfiber propagation constant, which will further change the optical length. In order to compensate the variation of the optical length difference, a tunable optical delay line (ODL) is inserted into the other arm. By measuring the delay of the ODL, the ambient RI can be simply demodulated. A high RI sensitivity of about 7159 mu m/refractive index unit is achieved at microfiber diameter of 2.0 mu m. (C) 2011 Optical Society of America

引用

页码：67 / 69

页数：3

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