材料科学
折射率
表面等离子共振
光学
多模光纤
光纤传感器
表面等离子体子
光纤
渐变折射率纤维
共振(粒子物理)
光电子学
等离子体子
纳米技术
纳米颗粒
粒子物理学
物理
作者
Bingjie Jin,Dongning Wang
出处
期刊:Optics Letters
[The Optical Society]
日期:2022-10-07
卷期号:47 (20): 5329-5329
被引量:3
摘要
A multimode fiber surface plasmon resonance sensor based on a down–up taper for refractive index measurement is proposed and demonstrated. The device is fabricated by splicing two multimode fibers in a heating and pushing process to form an up taper, followed by heating and pulling the fiber adjacent to the up-taper area to form a down taper, and then using a magnetron sputtering technique to deposit a Cr + Ag layer of 50 nm on the surface of the down–up taper. Such a structure effectively increases the taper ratio and hence improves the measurement sensitivity. The experimental results obtained show that in the refractive index range of 1.345–1.375, the refractive index sensitivity achieved is ∼3264.01 nm/RIU. The device has a compact size and its entire length is ∼2.75 mm. Moreover, the robustness of the device is better than that of the previously reported fiber surface plasmon resonance sensors due to its relatively large waist diameter of 40 µm for the down taper. The device is expected to have potential applications in biological and chemical sensing.
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