Optimization of Refractive Index Sensitivity in Nanofilm-Coated Long-Period Fiber Gratings Near the Dispersion Turning Point

被引：29
作者：
Zou, Fang [1 ,2 ]
Liu, Yunqi [2 ]
Mou, Chengbo [2 ]
Zhu, Shan [3 ]
机构：
[1] Hebei GEO Univ, Dept Informat Engn, Shijiazhuang 050031, Hebei, Peoples R China
[2] Shanghai Univ, Joint Int Res Lab Specialty Fiber Opt & Adv Commu, Shanghai Inst Adv Commun & Data Sci, Key Lab Specialty Fiber Opt & Opt Access Networks, Shanghai 200444, Peoples R China
[3] Shanghai Normal Univ, Tianhua Coll, Sch Engn, Shanghai 201815, Peoples R China
来源：
JOURNAL OF LIGHTWAVE TECHNOLOGY | 2020年 / 38卷 / 04期
基金：
中国国家自然科学基金;
关键词：
Sensitivity; Gratings; Refractive index; Optical fibers; Optical fiber sensors; Nanobioscience; Atomic layer deposition; dispersion turning point; long-period fiber gratings (LPFGs); mode transition; refractive Index sensor; titanium dioxide; TRANSITION MODE; SENSORS; DESIGN;
D O I：
10.1109/JLT.2019.2949373
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
In this article, we present detailed investigation of the high-performance long-period fiber gratings (LPFGs) based surrounding refractive index (SRI) sensors. A comprehensive design approach is proposed to optimize the sensitivity in a specific SRI range by combining adequately both dispersion turning point (DTP) and mode transition (MT) effects. The SRI sensitivity enhancement induced by the DTP and the MT is discussed respectively. The relative importance of the mechanisms in different SRI range is revealed. The mode transitions of the HE1,18 and HE1,20 are investigated in a single LPFG, where two high sensitivity ranges are obtained. The atomic layer deposition (ALD) technology is used to deposit the titanium dioxide (TiO2) nano-film on the LPFG surface. The SRI sensitivities of 1 x 10(4) nm /RIU in the SRI range 1.336-1.3397 and 4.2 x 10(4) nm/RIU in the range 1.4526-1.4561 are achieved, respectively. The experimental results are well consistent with the theoretical analysis.
引用
收藏
页码：889 / 897
页数：9
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