应用光学, 2019, 40 (3): 511, 网络出版: 2019-06-10   

侧边抛磨的U型金溅射塑料光纤等离子体共振传感器

Side-grinding U-shaped gold sputter plastic fiber SPR sensor
作者单位
中北大学 山西省光电信息与仪器工程技术研究中心,山西 太原 030051
摘要
为了测量溶液折射率变化,对塑料光纤纤芯表面的纤芯-金层-液体的3层膜结构进行研究,制作了一种使用U型结构并结合侧边抛磨方法的表面等离子体共振传感器。将截取的一段塑料光纤弯曲成为U型,并在烘箱中通过较高温度使这段光纤的曲率固定,对弯曲部分的外表面进行抛光,暴露该位置塑料光纤芯层并在其上溅射金纳米薄膜层,将制备好的传感器浸入不同折射率的液体中,使用光谱分析仪观察光谱的移动。实验结果表明:当塑料光纤SPR传感器测量折射率变化范围在1.333~1.406的液体时,可以通过光谱观察到随着液体折射率的增大,等离子体共振吸收峰位置也不断地向波长增大的方向移动,并且二者之间存在线性关系,其灵敏度为7.5×10-4 RIU/nm。该传感器探头具有灵敏度高、小型化、易制备、低成本的特点。
Abstract
In order to measure the change of the refractive index of solution, the three layers structure of fiber core-gold layer-liquid on the surface of plastic optical fiber core was studied.A surface plasmon resonance(SPR) sensor using U-shaped structure combined with side polishing method was developed. First, a segment of plastic fiber was bent into a U shape, and the curvature of the segment was fixed at higher temperatures in the oven. The outer surface of the curved part was then polished to expose the plastic fiber core layer at the position and to sputter the gold nano-film layer on it. Finally, the prepared sensor was immersed in the liquid with different refractive indices, and the movement of the spectrum was observed using a spectral analyzer. The experimental results show that when the plastic optical fiber SPR sensor measures the liquid with the refractive index variation range of 1.333~1.406, it can be observed through the spectrum that with the increase of the liquid refractive index, the plasma resonance absorption peak position is also moving towards the direction of wavelength increase, and there is a linear relationship between the two, and its sensitivity is 7.5×10-4 RIU/nm. The sensor probe has the characteristics of miniaturization, easy preparation and low cost.

周建乔, 景宁, 王志斌, 李克武. 侧边抛磨的U型金溅射塑料光纤等离子体共振传感器[J]. 应用光学, 2019, 40(3): 511. ZHOU Jianqiao, JING Ning, WANG Zhibin, LI Kewu. Side-grinding U-shaped gold sputter plastic fiber SPR sensor[J]. Journal of Applied Optics, 2019, 40(3): 511.

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