摘要
提出并实现了两种结构的裸露纤芯边孔光纤布拉格光栅(SH-FBGs)的折射率传感器。第一种,采用光纤侧面抛磨法抛磨刻有FBG的边孔光纤(SHF)的一个空气孔,得到D形横截面SH-FBG传感器,在1.380折射率附近灵敏度约为24.0 nm/RIU(RIU为单位折射率)。另一种,通过化学腐蚀法腐蚀刻有FBG的边孔光纤的两个空气孔,得到X形横截面SH-FBG传感器,在1.333~1.340折射率范围内,折射率灵敏度约为15.1 nm/RIU,该数值可通过腐蚀方案进一步得到优化。由于X形SH-FBG传感器对应两个偏振的模式,表现出对外部折射率变化的响应不同而对温度变化的响应相同的特性,因此可作为与温度无关的折射率传感器。设计的两种传感器具有的空气孔可以作为微流通道,有助于实现在线检测和给药,具有结构简单、操作方便等优点,在生物化学、医学等领域中拥有良好的应用前景。
Herein,two refractive index sensors based on exposed-core side-hole fiber Bragg gratings(SH-FBGs)with D-shaped and X-shaped fiber cross sections were proposed and demonstrated.One SH-FBG sensor with the Dshaped fiber cross section was fabricated using the side-polishing technique,in which an air hole of the side-hole fiber(SHF)engraved with the FBG is polished.Another SH-FBG sensor with the X-shaped fiber cross section was developed using the wet chemical etching method,in which two air holes of the SHF engraved with the FBG are etched.The refractive index sensitivities of the first and second sensors are measured to be 24.0 and 15.1 nm/RIU(RIU is the unit refractive index),respectively,for the refractive index of approximately 1.380 and 1.333-1.340,respectively.The 15.1 nm/RIU value can be further optimized using the corrosion scheme.Because the X-shaped SH-FBG sensor shows two polarized reflection peaks owing to birefringence and exhibits different responses to changes in external refractive index yet the same response to temperature variations,it can be used as a temperatureindependent refractive index sensor.The air holes of the designed two sensors can be used as microfluidic channels,potentially simultaneously facilitating online detection and drug delivery.Our device is characterized by structural simplification and easy operation and thus is potentially useful for biosensing and medical applications.
作者
蒙云清
董贤
武创
李杰
关柏鸥
Meng Yunqing;Dong Xian;Wu Chuang;Li Jie;Guan Baiou(Guangdong Key Laboratory of Optical Fiber Sensing and Communications,Institute of Photonics Technology,Jinan University,Guangzhou,Guangdong 511443,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2022年第1期117-125,共9页
Laser & Optoelectronics Progress
基金
国家自然科学基金(62075087)
广东省自然科学基金(2014A030306040,2018A030313440)
广东省特支计划科技创新青年拔尖人才项目(2016TQ03X124,2019TQ05X136)
广州市珠江科技新星项目(201806010197)。
关键词
光纤光学
光纤布拉格光栅
光纤传感器
折射率灵敏度
边孔光纤
fiber optics
fiber Bragg grating
fiber optics sensor
refractive index sensitivity
side-hole fiber
