Numerical and experimental analysis of sensitivity-enhanced RI sensor based on Ex-TFG in thin cladding fiber


We report a highly sensitive refractive index (RI) sensor in the aqueous solution, which is based on an 81°-tilted fiber grating structure inscribed into a thin cladding fiber with 40 μm cladding radius. The numerical analysis has indicated that the RI sensitivity of cladding resonance mode of the grating can be significantly enhanced with reducing cladding size. This has been proved by the experimental results as the RI sensitivities of TM and TE resonance peaks in the index region of 1.345 have been increased to 1180 nm/RIU and 1150 nm/RIU, respectively, from only 200 and 170 nm/RIU for the same grating structure inscribed in standard telecom fiber with 62.5-μm cladding radius. Although the temperature sensitivity has also increased, the change in temperature sensitivity is still insignificant in comparison with RI sensitivity enhancement.

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Divisions: College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
Additional Information: © 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. Funding: European Union 7th Framework Programme [FP7/2007−2013] under Grant 295208.
Uncontrolled Keywords: refractive index sensing,sensitivity,tilted fiber grating,Atomic and Molecular Physics, and Optics
Publication ISSN: 0733-8724
Last Modified: 06 May 2024 07:12
Date Deposited: 10 Aug 2015 10:10
Full Text Link: http://ieeexplo ... rnumber=7089159
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2015-04-20
Published Online Date: 2015-04-20
Authors: Yan, Zhijun
Sun, Zhongyuan
Zhou, Kaiming (ORCID Profile 0000-0002-6011-1912)
Luo, Binbin
Li, Jianfeng
Wang, Hushan
Wang, Yishan
Zhao, Wei
Zhang, Lin (ORCID Profile 0000-0002-1691-5577)



Version: Accepted Version

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