光学
折射率
灵敏度(控制系统)
超细纤维
材料科学
光电子学
游标尺
梳理
光纤传感器
光纤
物理
电子工程
工程类
复合材料
作者
Yuxuan Jiang,Yating Yi,Gilberto Brambilla,Pengfei Wang
出处
期刊:Optics Letters
[The Optical Society]
日期:2020-02-27
卷期号:45 (5): 1268-1268
被引量:36
摘要
We demonstrate a novel, to the best of our knowledge, refractive index (RI) sensor based on the Vernier effect in dual-microfiber coupler (MFC) structures. The sensor sensitivity was studied both theoretically and experimentally. The numerical results show that by tracing the wavelength shifts of the envelope formed by the Vernier effect, the sensitivity can be improved by several times compared to that obtained for normal coupler-based sensors. In this Letter, two MFCs with a width and free spectral range (FSR) of $\sim{3.5}\;{\unicode{x00B5} \rm m}$∼3.5µm and 6 nm, respectively, were fabricated. Based on the sensitivity of 5820 nm/RIU for a single coupler, we experimentally achieved an ultra-high sensitivity of 126,540 nm/RIU using dual MFCs by the Vernier effect in the RI range of 1.3350 to 1.3455, which shows good agreement with numerical simulations. The proposed all-fiber RI sensor has the advantages of high sensitivity and low cost and can find applications in chemical and biological detection as well as electronic/magnetic field measurement.
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