Fiber-interface directional coupler inscribed by femtosecond laser for refractive index measurements

被引：20

作者：

Han, Jinli ^{[1
,2
]}

Zhang, Yunfang ^{[1
,2
]}

Liao, Changrui ^{[1
,2
]}

Jiang, Yuying ^{[1
,2
]}

Wang, Ying ^{[1
,2
]}

Lin, Chupao ^{[1
,2
]}

Liu, Shen ^{[1
,2
]}

Wang, Jiachen ^{[1
,2
]}

Zhang, Zhe ^{[1
,2
]}

Zhou, Jiangtao ^{[3
]}

Wang, Yiping ^{[1
,2
]}

机构：

[1] Shenzhen Univ, Coll Phys & Optoelect Engn, Guangdong & Hong Kong Joint Res Ctr Opt Fibre Sen, Shenzhen 518060, Peoples R China

[2] Shenzhen Univ, Minist Educ & Guangdong Prov, Key Lab Optoelect Devices & Syst, Shenzhen 518060, Peoples R China

[3] Ecole Polytech Fed Lausanne EPFL, Lab Phys Living Matter, CH-1015 Lausanne, Switzerland

来源：

OPTICS EXPRESS | 2020年 / 28卷 / 10期

基金：

中国国家自然科学基金;

关键词：

MACH-ZEHNDER INTERFEROMETER; SINGLE-MODE FIBER; WAVE-GUIDE; SENSOR; TEMPERATURE; SENSITIVITY;

D O I：

10.1364/OE.390674

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A novel fiber-interface directional waveguide coupler was inscribed on the surface of a coreless fiber by femtosecond laser, and was successfully applied to highly sensitive refractive index (RI) measurements. The primary arm was first inscribed to couple light from a lead-in single mode fiber to the fiber interface, then back to a lead-out single mode fiber. A side arm was inscribed parallel and in close proximity to the primary arm. Light propagating in the primary arm could then be efficiently coupled into the side arm when a phase-matching condition was met, which produced a dramatic spectral dip at the coupling wavelength. The proposed device achieved a sensitivity as high as similar to 8249 nm/RIU over an RI range of 1.44-1.45, due to strong evanescent fields excited in fiber-interface waveguides. The proposed in-fiber directional coupler exhibits high mechanical strength, a compact configuration, and excellent RI sensitivity. As such, it has significant potential for practical applications in biochemical sensing. (c) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

引用

页码：14263 / 14270

页数：8

共 23 条

[1] High Sensitivity Fiber Refractometer Based on an Optical Microfiber Coupler [J].