Highly sensitive and stable probe refractometer based on configurable plasmonic resonance with nano-modified fiber core
나노 변성 섬유 코어를 기반으로 플라즈마 공진을 구성할 수 있는 고감도 안정 프로브 굴절기
Refractómetro de sonda estable de alta sensibilidad basado en resonancia de plasma configurable en núcleo de fibra nanomodificada
Réfractomètre de sonde stable de haute sensibilité basé sur la résonance plasma configurable de noyau de fibre nanomodifié
Высокочувствительный стабилизатор преломления зонда на основе нано - модифицированного волокнистого сердечника
Jianying Jing 井建迎 ¹ ² ³, Kun Liu 刘琨 ¹ ² ³, Junfeng Jiang 江俊峰 ¹ ² ³, Tianhua Xu 徐天华 ¹ ² ³, Shuang Wang 王双 ¹ ² ³, Tiegen Liu 刘铁根 ¹ ² ³
¹ School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China
中国 天津 天津大学精密仪器与光电子工程学院
² Key Laboratory of Opto-Electronics Information Technology, Ministry of Education, Tianjin University, Tianjin 300072, China
中国 天津 光电信息技术教育部重点实验室(天津大学)
³ Tianjin Optical Fiber Sensing Engineering Center, Institute of Optical Fiber Sensing, Tianjin University, Tianjin 300072, China
中国 天津 天津大学光纤传感研究所 天津市光纤传感工程中心
Opto-Electronic Advances, 25 June 2023

A dispersion model is developed to provide a generic tool for configuring plasmonic resonance spectral characteristics. The customized design of the resonance curve aiming at specific detection requirements can be achieved. According 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 solution.

The new-type sensing structure avoids excessive broadening and redshift of the resonance dip, which provides more possibilities for the surface modification of other functional nanomaterials. The 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 WSe2 layer synergistically and significantly enhance the sensitivity of the sensor. Experimental 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 sensor.

The results achieve good agreements with numerical simulations, demonstrate a better level compared to similar reported studies, and verify the correctness of the dispersion model. The 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 sensor. This indicates a high detection accuracy of the sensor.

The dense Au layer effectively prevents the intermediate nanomaterials from shedding and chemical degradation, which enables the sensor with high stability. Furthermore, the terminal reflective sensing structure can be used as a practical probe and can allow a more convenient operation.
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