Refractive Index Sensing Characteristics of Etched Double-Cladding Fiber Coated with Nanofilm

被引：0

作者：

Cheng Jiajing ^{[1
]}

Pang Fufei ^{[1
]}

Zhu Shan ^{[2
]}

Zhang Xiaobei ^{[1
]}

Wang Tingyun ^{[1
]}

机构：

[1] Shanghai Univ, Key Lab Specialty Fiber Opt & Opt Access Networks, Joint Int Res Lab Specialty Fiber Opt & Adv Commu, Shanghai Inst Adv Commun & Data Sci,Sch Commun &, Shanghai 200444, Peoples R China

[2] Shanghai Normal Univ, Sch Engn, Tianhua Coll, Shanghai 201815, Peoples R China

来源：

CHINESE JOURNAL OF LASERS-ZHONGGUO JIGUANG | 2018年 / 45卷 / 08期

关键词：

fiber optics; refractive index sensing; double-cladding fiber; etch; nanofilm;

D O I：

10.3788/CJL201845.0810003

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We propose a sensor based on etched double-cladding fiber (DCF) coated with nanofilm. The coupling mode, resonant wavelength and the best sensing interval can be adjusted by control of the etching time and coating thickness. The evolution of mode behaviors and refractive index (RI) sensitivity as DCF cladding thickness decreasing is theoretically analyzed. In the experiment, 2000 layers of Al2O3 nanofilms are coated on a DCF with an outer diameter of 59 mu m to achieve a sensitivity of 1200 nm/RIU in the RI range from 1.336 to 1.356, in which RIU is RI unit. The RI sensitivity of proposed fiber is 24 times than that of bare DCF. The sensor has the advantages of high sensitivity, good consistency, controllable coupling mode, and customizable sensor parameters. It is expected to have great application value in biomedicine, chemical detection and so on.

引用

页数：8

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