期刊
SENSORS
卷 20, 期 8, 页码 -出版社
MDPI
DOI: 10.3390/s20082431
关键词
Mach-Zehnder interferometer (MZI); long-period grating (LPG); optical fiber sensors; refractive index sensing; femtosecond laser micromachining; thin films; multiparameter sensing; cross-sensitivity
资金
- National Science Center (NCN) [2018/29/B/ST7/02552]
- National Centre for Research and Development (NCBiR) as a part of Techmatstrateg grant [347324/12/NCBR/2017]
This work discusses sensing properties of a long-period grating (LPG) and microcavity in-line Mach-Zehnder interferometer (mu IMZI) when both are induced in the same single-mode optical fiber. LPGs were either etched or nanocoated with aluminum oxide (Al2O3) to increase its refractive index (RI) sensitivity up to approximate to 2000 and 9000 nm/RIU, respectively. The mu IMZI was machined using a femtosecond laser as a cylindrical cavity (d = 60 mu m) in the center of the LPG. In transmission measurements for various RI in the cavity and around the LPG we observed two effects coming from the two independently working sensors. This dual operation had no significant impact on either of the devices in terms of their functional properties, especially in a lower RI range. Moreover, due to the properties of combined sensors two major effects can be distinguished-sensitivity to the RI of the volume and sensitivity to the RI at the surface. Considering also the negligible temperature sensitivity of the mu IMZI, it makes the combination of LPG and mu IMZI sensors a promising approach to limit cross-sensitivity or tackle simultaneous measurements of multiple effects with high efficiency and reliability.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据