In-line open-cavity Fabry-Perot interferometer formed by C-shaped fiber fortemperature-insensitive refractive index sensing

被引：94

作者：

Wu, Chuang ^{[1
]}

Liu, Zhengyong ^{[2
]}

Zhang, A. Ping ^{[2
]}

Guan, Bai-Ou ^{[1
]}

Tam, Hwa-Yaw ^{[2
]}

机构：

[1] Jinan Univ, Inst Photon Technol, Guangzhou 510632, Guangdong, Peoples R China

[2] Hong Kong Polytech Univ, Dept Elect Engn, Photon Res Ctr, Kowloon, Hong Kong, Peoples R China

来源：

OPTICS EXPRESS | 2014年 / 22卷 / 18期

基金：

中国国家自然科学基金;

关键词：

PHOTONIC-CRYSTAL-FIBER; FEMTOSECOND LASER; ALL-FIBER; MICROFLUIDIC REFRACTOMETER; HIGH-RESOLUTION; TIP SENSOR; TEMPERATURE; PRESSURE;

D O I：

10.1364/OE.22.021757

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We report an open-cavity optical fiber Fabry-P rot interferometer (FPI) capable of measuring refractive index with very low temperature cross-sensitivity. The FPI was constructed by splicing a thin piece of C-shaped fiber between two standard single-mode fibers. The refractive index (RI) response of the FPI was characterized using water-ethanol mixtures with RI in the range of 1.33 to 1.36. The RI sensitivity was measured to be 1368 nm/RIU at the wavelength of 1600 nm with good linearity. Thanks to its all-glass structure, the FPI exhibits very low temperature cross-sensitivity of 3.04 x 10(-7) RIU/degrees C. The effects of cavity length on the performance of the sensor were also studied. A shorter cavity gives rise to broader measurement range while offering larger detection limit, and vice versa. What's more, the effect of material dispersion of analyte on the sensitivity of open-cavity FPIs was identified for the first time. The sensor is compact in size and easy to fabricate. It is potentially useful for label-free optical sensing of chemical and biological samples. (C)2014 Optical Society of America

引用

页码：21757 / 21766

页数：10