Spatially Modulated Fiber Speckle for High-Sensitivity Refractive Index Sensing

Guo，Penglai1,2; Liu，Huanhuan2,3,4; Zhou，Zhitai2; Hu，Jie2; Wang，Yuntian2; Peng，Xiaoling1; Yuan，Xun1; Shu，Yiqing5; Zhang，Yingfang1; Dang，Hong2; Xu，Guizhen2; Zhang，Aoyan2; Xue，Chenlong2; Hu，Jiaqi2; Shao，Liyang2; Chen，Jinna2; Li，Jianqing1; Shum，Perry Ping2,3,4,6

2023-08-01

10.3390/s23156814

Sensors   Impact Factor & Quartile

1424-8220

1424-8220

A fiber speckle sensor (FSS) based on a tapered multimode fiber (TMMF) has been developed to measure liquid analyte refractive index (RI) in this work. By the lateral and axial offset of input light into TMMF, several high-order modes are excited in TMMF, and the speckle pattern is spatially modulated, which affects an asymmetrical speckle pattern with a random intensity distribution at the output of TMMF. When the TMMF is immersed in the liquid analyte with RI variation, it influences the guided modes, as well as the mode interference, in TMMF. A digital image correlations method with zero-mean normalized cross-correlation coefficient is explored to digitize the speckle image differences, analyzing the RI variation. It is found that the lateral- and axial-offsets-induced speckle sensor can enhance the RI sensitivity from 6.41 to 19.52 RIU compared to the one without offset. The developed TMMF speckle sensor shows an RI resolution of 5.84 × 10 over a linear response range of 1.3164 to 1.3588 at 1550 nm. The experimental results indicate the FSS provides a simple, efficient, and economic approach to RI sensing, which exhibits an enormous potential in the image-based ocean-sensing application.

optical fiber sensor refractive index sensing speckle tapered multimode fiber

SCI

English

Others

Basic and Applied Basic Research Foundation of Guangdong Province[2021B1515120013];Natural Science Foundation of Guangdong Province[2022A1515011434];National Natural Science Foundation of China[61827819];National Natural Science Foundation of China[62205139];Shenzhen Science and Technology Innovation Program[SGDX20211123114001001];

Chemistry ; Engineering ; Instruments & Instrumentation

Chemistry, Analytical ; Engineering, Electrical & Electronic ; Instruments & Instrumentation

WOS:001046439500001

MDPI

CHEMISTRY

2-s2.0-85167745104

Scopus

1.School of Computer Science and Engineering,Faculty of Innovation Engineering,Macau University of Science and Technology,Avenida Wai Long, Taipa,999078,Macao
2.Department of Electronic and Electrical Engineering,College of Engineering,Southern University of Science and Technology,Shenzhen,1088 Xueyuan Avenue,518055,China
3.State Key Laboratory of Optical Fiber and Cable Manufacture Technology,Southern University of Science and Technology,Shenzhen,518055,China
4.Key Laboratory of Optoelectronics Integrated Circuit Intellisense of Guangdong,Southern University of Science and Technology,Shenzhen,518055,China
5.Guangdong-Hong Kong-Macao Joint Laboratory for Intelligent Micro-Nano Optoelectronic Technology,Foshan University,Foshan,18 Jiang-Wan-Yi-Lu,528000,China
6.Pengcheng Laboratory,Shenzhen,2 Xingke 1st Street,518055,China

Guo，Penglai,Liu，Huanhuan,Zhou，Zhitai,et al. Spatially Modulated Fiber Speckle for High-Sensitivity Refractive Index Sensing[J]. Sensors,2023,23(15).

Guo，Penglai.,Liu，Huanhuan.,Zhou，Zhitai.,Hu，Jie.,Wang，Yuntian.,...&Shum，Perry Ping.(2023).Spatially Modulated Fiber Speckle for High-Sensitivity Refractive Index Sensing.Sensors,23(15).

Guo，Penglai,et al."Spatially Modulated Fiber Speckle for High-Sensitivity Refractive Index Sensing".Sensors 23.15(2023).