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Title: Highly sensitive gas refractometers based on optical microfiber modal interferometers operating at dispersion turning point
Authors: Zhang, Nancy Meng Ying
Li, Kaiwei
Zhang, Nan
Zheng, Yu
Zhang, Ting
Qi, Miao
Shum, Ping
Wei, Lei
Keywords: Optical Microfiber Modal Interferometers
Gas Refractometers
DRNTU::Engineering::Electrical and electronic engineering
Issue Date: 2018
Source: Zhang, N. M. Y., Li, K., Zhang, N., Zheng, Y., Zhang, T., Qi, M., . . . Wei, L. (2018). Highly sensitive gas refractometers based on optical microfiber modal interferometers operating at dispersion turning point. Optics Express, 26(22), 29148-29158. doi:10.1364/OE.26.029148
Series/Report no.: Optics Express
Abstract: In most fiber-optic gas sensing applications where the interested refractive index (RI) is ~1.0, the sensitivities are greatly constrained by the large mismatch between the effective RI of the guided mode and the RI of the surrounding gaseous medium. This fundamental challenge necessitates the development of a promising fiber-optic sensing mechanism with the outstanding RI sensitivity to achieve reliable remote gas sensors. In this work, we report a highly sensitive gas refractometer based on a tapered optical microfiber modal interferometer working at the dispersion turning point (DTP). First, we theoretically analyze the essential conditions to achieve the DTP, the spectral characteristics, and the sensing performance at the DTP. Results show that nonadiabatic tapered optical microfibers with diameters of 1.8-2.4 µm possess the DTPs in the near-infrared range and the RI sensitivities can be improved significantly around the DTPs. Second, we experimentally verify the ultrahigh RI sensitivity around the DTP using a nonadiabatic tapered optical microfiber with a waist diameter of ~2 μm. The experimental observations match well with the simulation results and our proposed gas refractometer provides an exceptional sensitivity as high as −69984.3 ± 2363.3 nm/RIU.
DOI: 10.1364/OE.26.029148
Schools: School of Electrical and Electronic Engineering 
Research Centres: CNRS International NTU THALES Research Alliances 
Rights: © 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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