摘要
利用大尺寸纳米金壳(gold nanoshell,AuNS)的局域表面等离子体共振(localized surface plasmon resonance,LSPR)效应,研究基于光纤Bragg光栅(fiber Bragg grating,FBG)的LSPR折射率(refractive index,RI)传感器原理及特性。通过时域有限差分法分析AuNS对传感器RI灵敏度增强的物理机制,并构建了基于腐蚀型光纤Bragg光栅(etched fiber Bragg grating,eFBG)的LSPR RI传感器,通过标定获得传感器在不同外部折射率(surrounding refractive index,SRI)环境下的响应光谱。实验结果表明:eFBG-LSPR传感器的基于谐振强度变化的RI灵敏度为-72.33 dB/RIU,相比eFBG的RI灵敏度提高了约61.3倍,验证了理论分析的正确性,该传感器在生化传感、环境监测等领域具有良好的应用前景。
Based on the localized surface plasmon resonance(LSPR)effect of the large-sized gold nanoshells(AuNS),the principle and characteristics of fiber Bragg grating(FBG)LSPR refractive index(RI)sensor was studied.The physical mechanism of the RI sensitivity enhancement of the AuNS for the sensor was studied by the finite difference time domain method.The LSPR RI sensor based on the etched fiber Bragg grating(eFBG)was constructed,and the response spectra under different surrounding refractive index(SRI)environments were obtained.The experimental results show that the intensity-based RI sensitivity of the eFBG-LSPR sensor was-72.33 dB/RIU,which was 61.3 times higher than that of eFBG,verifying the validation of the theoretical analysis.The proposed sensor has good application prospects in the fields of biochemical sensing and environmental monitoring.
作者
古洪
张杨
杨翔文
罗彬彬
石胜辉
邹雪
刘开俊
赵明富
GU Hong;ZHANG Yang;YANG Xiangwen;LUO Binbin;SHI Shenghui;ZOU Xue;LIUKaijun;ZHAO Mingfu(Chongqing Key Laboratory of Optical Fiber Sensor and Photoelectric Detection,Chongqing University of Technology,Chongqing 400054,China)
出处
《光电子．激光》
CAS
CSCD
北大核心
2022年第7期673-679,共7页
Journal of Optoelectronics·Laser
基金
国家自然科学基金(61875026)
重庆英才青年拔尖人才计划(cstc2021ycjh-bgzxm0128)
重庆市教委科学技术研究重点项目(KJZD-K201901101)
重庆理工大学研究生科研创新项目(gzlcx20223054)资助项目
关键词
光纤BRAGG光栅
纳米金壳
局域表面等离子体共振
折射率
时域有限差分法
fiber Bragg grating(FBG)
gold nanoshell(AuNS)
localized surface plasmon resonance(LSPR)
refractive index(RI)
finite difference time domain
作者简介
罗彬彬(1981-),男,博士,教授,硕士生导师,主要从事光纤传感传感器原理及其在生物医学、智能结构工程检测中的应用研究,E-mail:luobinbin@cqut.edu.cn
