Asymmetrical tapered SMS fiber coupler for simultaneous measurement of temperature and refractive index and its application for biosensing  

作　　者：Zheyu Wu Bin Liu Jiangfeng Zhu Juan Liu Shengpeng Wan Tao Wu Jinghua Sun 吴哲宇;刘彬;朱江峰;刘娟;万生鹏;吴涛;孙敬华(School of Physics and Optoelectronic Engineering,Xidian University,Xi’an 710071,China;National Engineering Laboratory for Destructive Testing and Optoelectronic Sensing Technology and Application,Nanchang Hangkong University,Nanchang 330063,China;School of Electrical Engineering&Intelligentization,Dongguan University of Technology,Dongguan 523808,China)

机构地区：[1]School of Physics and Optoelectronic Engineering,Xidian University,Xi’an 710071,China [2]National Engineering Laboratory for Destructive Testing and Optoelectronic Sensing Technology and Application,Nanchang Hangkong University,Nanchang 330063,China [3]School of Electrical Engineering&Intelligentization,Dongguan University of Technology,Dongguan 523808,China

出　　处：《Chinese Optics Letters》2020年第6期34-39,共6页中国光学快报（英文版）

基　　金：This work was supported by the National Natural Science Foundations of China(Nos.61665007 and 11864025);the Natural Science Foundation of Jiangxi(Nos.20192ACBL21051 and 20172BCB22012);Key Projects of Basic Research and Applied Research in Universities in Guangdong Province(No.2018KZDXM067).

摘　　要：An asymmetrical tapered singlemode–multimode–singlemode(SMS)fiber coupler based on two parallel physical contact SMS fiber structures was proposed.Since the coupler includes modes both from fiber core and cladding,two dips of the transmission spectrum exhibit different sensing characteristics to the surrounding temperature and refractive index(RI)change,which allows the use of the standard matrix inversion method to determine temperature and RI simultaneously.The temperature sensitivities of 0.0498 and 0.0324 nm/℃ and RI sensitivities of 1151.76 and 1325.66 nm/RIU have been achieved,respectively.For biosensing application,with the functionalized fiber coupler sensor,a human chorionic gonadotropin concentration of 0.05 mIU/mL has been detected for a wavelength shift of 0.2 nm with good stability and excellent selectivity.The developed tapered SMS fiber coupler structure has advantages of simultaneous measurement of two independent parameters,simple configuration,low cost,and good repeatability that offer a great potential for medical diagnostics.

关 键 词：optical fiber sensing fiber coupler BIOSENSOR human chorionic gonadotropin 

分 类 号：TN253[电子电信—物理电子学]