光学
干涉测量
材料科学
折射率
线性
偏移量(计算机科学)
马赫-曾德尔干涉仪
游标尺
物理
计算机科学
量子力学
程序设计语言
作者
Jiewen Li,Meng Zhang,Minggui Wan,Chunli Lin,Shihong Huang,Cuihong Liu,Qingping He,Xiaozhong Qiu,Xiaohui Fang
出处
期刊:Optics Express
[Optica Publishing Group]
日期:2020-01-29
卷期号:28 (3): 4145-4145
被引量:116
摘要
An ultrasensitive refractive index (RI) sensor based on enhanced Vernier effect is proposed, which consists of two cascaded fiber core-offset pairs. One pair functions as a Mach-Zehnder interferometer (MZI), the other with larger core offset as a low-finesse Fabry-Perot interferometer (FPI). In traditional Vernier-effect based sensors, an interferometer insensitive to environment change is used as sensing reference. Here in the proposed sensor, interference fringes of the MZI and the FPI shift to opposite directions as ambient RI varies, and to the same direction as surrounding temperature changes. Thus, the envelope of superimposed fringe manifests enhanced Vernier effect for RI sensing while reduced Vernier effect for temperature change. As a result, an ultra-high RI sensitivity of -87261.06 nm/RIU is obtained near the RI of 1.33 with good linearity, while the temperature sensitivity is as low as 204.7 pm/ °C. The proposed structure is robust and of low cost. Furthermore, the proposed scheme of enhanced Vernier effect provides a new perspective and idea in other sensing field.
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