Plasmonic gold nanoshell induced spectral effects and refractive index sensing properties of excessively tilted fiber grating  

作　　者：Binbin Luo Huafeng Lu Shenghui Shi Mingfu Zhao Jiao Lu Yajie Wang  Xin Wang 罗彬彬;卢化峰;石胜辉;赵明富;鲁姣;王亚杰;王鑫(Chongqing Key Laboratory of Optical Fiber Sensor and Photoelectric Detection,Chongqing University of Technology)

机构地区：Chongqing Key Laboratory of Optical Fiber Sensor and Photoelectric Detection, Chongqing University of Technology, Chongqing 400054, China

出　　处：《Chinese Optics Letters》2018年第10期9-13,共5页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.61875026 and 61505017);the Foundation and Cutting-Edge Research Projects of the Chongqing Science and Technology Commission(No.cstc2018jcyjAX0122);the Graduate Student Innovation Program of the Chongqing University of Technology(No.ycx2018238)

摘　　要：We demonstrate a fiber refractive index（RI） sensor based on an excessively tilted fiber grating（ExTFG）immobilized by large-size plasmonic gold nanoshells（GNSs）. The GNSs are covalently linked on ExTFG surface.Experimental results demonstrate that both the intensity of the transverse magnetic（TM） and transverse electric（TE） modes of ExTFG are significantly modulated by the localized surface plasmon resonance（LSPR） of GNSs due to the wide-range absorption band. The wavelength RI sensitivities of the TM and TE modes in the low RI range of 1.333–1.379 are improved by ～25% and ～14% after GNSs immobilization, respectively, and the intensity RI sensitivities are ～599%/RIU and ～486%/RIU, respectively.We demonstrate a fiber refractive index（RI） sensor based on an excessively tilted fiber grating（ExTFG）immobilized by large-size plasmonic gold nanoshells（GNSs）. The GNSs are covalently linked on ExTFG surface.Experimental results demonstrate that both the intensity of the transverse magnetic（TM） and transverse electric（TE） modes of ExTFG are significantly modulated by the localized surface plasmon resonance（LSPR） of GNSs due to the wide-range absorption band. The wavelength RI sensitivities of the TM and TE modes in the low RI range of 1.333–1.379 are improved by ～25% and ～14% after GNSs immobilization, respectively, and the intensity RI sensitivities are ～599%/RIU and ～486%/RIU, respectively.

关 键 词：RIU TM TE Plasmonic gold nanoshell induced spectral effects and refractive index sensing properties of excessively tilted fiber grating 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]