氧化石墨烯修饰的色散拐点长周期光纤光栅的折射率传感特性  

Refractive Index Sensing Characteristics of Dispersion-Turning-Point Long Period Fiber Grating Functionalized with Graphite Oxide

作　　者：赵明富[1] 王鑫[1] 罗彬彬[1] 石胜辉[1] 刘志江 聂青林 巫涛江 ZHAO Mingfu;WANG Xin;LUO Binbin;SHI Shenghui;LIU Zhijiang;NIE Qinglin;WU Taojiang(Chongqing Key Laboratory Optical Fiber Sensor and Photoelectric Detection,Chongqing University of Technology・Chongqing 400054;Chongqing Energy College,Chongqing 402247,CHN)

机构地区：[1]重庆理工大学光纤传感与光电检测重庆市重点实验室,重庆400054 [2]重庆能源职业学院,重庆402247

出　　处：《半导体光电》2020年第5期632-637,共6页Semiconductor Optoelectronics

基　　金：重庆市科委前沿与基础项目(cstc2019jcyjmsxmX0093);重庆市教委科技重点项目(KJZDK201905601);重庆市教委科学技术研究项目(KJQN201801121);重庆理工大学研究生创新基金项目(ycx20192048,ycx20192046)。

摘　　要：研究了氧化石墨烯(Graphene Oxide,GO)修饰的色散拐点长周期光纤光栅(Dispersion-Turning-Point Long Period Fiber Grating,DTP-LPFG)传感器,分析了其光谱特性及对外部折射率的灵敏度特性。利用准连续KrF激光器在载氢单模石英光纤上制作周期约为136μm的DTP-LPFG,采用氢键结合的方式将GO涂覆于光栅表面,构成基于GO修饰的DTPLPFG传感器。实验结果表明:随着GO在DTP-LPFG表面的沉积,其双谐振峰的左峰发生蓝移,右峰发生红移,双峰间距增大;在1.33~1.38折射率范围内,该传感器在涂覆GO后,谐振双峰间距变化量的折射率灵敏度约为831.89nm/RIU,较未修饰GO的DTP-LPFG提高了1.05倍。The optical sensor based on dispersion-turning-point long period fiber grating(DTP-LPFG)modified by graphene oxide(GO)was investigated,and its spectral characteristics and sensitivity to external refractive index(RI)were analyzed.The DTP-LPFG with a period of about 136μm was fabricated by using aquasi-continuous KrF laser in a hydrogen loaded singlemode fiber.GO was fixed on the grating surface by hydrogen bonding to form a GO functionalized DTP-LPFG sensor.The experimental results show that there are a blue-shift and a red-shift of the resonant bands at the lower and higher wavelengths,respectively,and the wavelength separation between the dual peaks increases with the deposition of GO on the surface of the DTPLPFG.The sensitivity of the resonance bimodal spacing variation of the GO coated DTP-LPFG sensor is about 831.89 nm/RIU in the RI range of 1.33~1.38,which is 1.05 times higher than that of the uncoated one.

关 键 词：光纤传感 色散拐点长周期光纤光栅 氧化石墨烯 折射率灵敏度 

分 类 号：TN253[电子电信—物理电子学]