光学
折射率
灵敏度(控制系统)
材料科学
光纤
波长
天文干涉仪
光纤传感器
干扰(通信)
渐变折射率纤维
纤维
传输(电信)
干涉测量
物理
电信
频道(广播)
电子工程
计算机科学
复合材料
工程类
作者
Yi Li,Yinping Miao,Fang Wang,Jiajun Wang,Zelong Ma,Luguang Wang,Xichao Di,Kailiang Zhang
出处
期刊:Optics Express
[The Optical Society]
日期:2018-12-24
卷期号:26 (26): 34776-34776
被引量:17
摘要
We propose an optical fiber sensor for low refractive index (RI) based on a serial-tilted-tapered fiber (STTF), which can be considered as two tightly concatenated micro Mach-Zehnder interferometers (MZIs). The STTF has a compact length of 959.8 μm, and can realize point detection and sensing in limited space. Numerical simulations reveal that a significantly strong evanescent field occurs around the STTF, making it to have the high sensitivity for surrounding RI. In the experiments, the interference dips show the nonlinear wavelength and intensity responses with increasing RI from 1.3395 to 1.3538. In the RI range of 1.3532~1.3538, the RI sensitivities reach the highest value of 2300 nm/RIU and -16183.33 dB/RIU. Moreover, the transmission spectrum of the STTF is low sensitive to temperature. These results indicate that our proposed sensor can be an appropriate candidate in most chemical and biological applications.
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