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Highly sensitive and stable probe refractometer based on configurable plasmonic resonance with nano-modified fiber core

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Opto-Electronic Advances 2023年第6期6卷 38-51页

作者： Jianying Jing Kun Liu Junfeng Jiang Tianhua Xu Shuang Wang Tiegen Liu School of Precision Instruments and Opto-Electronics Engineering Tianjin UniversityTianjin 300072China Key Laboratory of Opto-Electronics Information Technology Ministry of EducationTianjin UniversityTianjin 300072China Tianjin Optical fiber Sensing Engineering Center Institute of Optical Fiber SensingTianjin UniversityTianjin 300072China

A dispersion model is developed to provide a generic tool for configuring plasmonic resonance spectral *** customized design of the resonance curve aiming at specific detection requirements can be *** to the model,a probe-type nano-modified fiber optic configurable plasmonic resonance(NMF-CPR)sensor with tip hot spot enhancement is demonstrated for the measurement of the refractive index in the range of 1.3332-1.3432 corresponding to the low-concentration biomarker *** new-type sensing structure avoids excessive broadening and redshift of the resonance dip,which provides more possibilities for the surface modification of other functional *** tip hot spots in nanogaps between the Au layer and Au nanostars(AuNSs),the tip electric field enhancement of AuNSs,and the high carrier mobility of the WSe_(2)layer synergistically and significantly enhance the sensitivity of the ***-perimental results show that the sensitivity and the figure of merit of the tip hot spot enhanced fiber NMF-CPR sensor can achieve up to 2995.70 nm/RIU and 25.04 RIU^(−1),respectively,which are 1.68 times and 1.29 times higher than those of the conventional fiber plasmonic resonance *** results achieve good agreements with numerical simulations,demonstrate a better level compared to similar reported studies,and verify the correctness of the dispersion *** detection resolution of the sensor reaches up to 2.00×10^(−5)RIU,which is obviously higher than that of the conventional side-polished fiber plasmonic resonance *** indicates a high detection accuracy of the *** dense Au layer effectively prevents the intermediate nanomaterials from shedding and chemical degradation,which enables the sensor with high ***,the terminal reflective sensing structure can be used as a practical probe and can allow a more convenient operation.

关键词： fiber photonics sensor customized plasmonic resonance curve nano-modified fiber core tip hot spot effect high sensitivity and stability

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