锥形微纳光纤传感器的优化设计
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摘要
锥形光纤在荧光传感领域应用广泛。其中,由自由基光聚合法制成的锥形微纳光纤(PTOF)具有制造工艺灵活、耗能低的优点。为了提高荧光收集效率,进而提高锥形微纳光纤传感器的灵敏度,文章在不同曝光时间和曝光功率下制作了不同尺寸的PTOFs作为传感头,对包埋在锥形尖端的荧光素进行荧光收集。实验结果表明,25μW,5s下生成的PTOF有较好的荧光收集效率,约为端面切平光纤的9.6倍。
Tapered fiber is widely used in the field of fluorescence sensing. Among them, the polymer-tipped optical fiber(PTOF) fabricated by free radical photopolymerization has the advantages of flexible fabrication process and low energy consumption.To improve the fluorescence collection characteristics and the sensitivity of the polymer-tipped optical fiber sensor, different sizes of PTOFs were fabricated as sensing heads under different exposure times and exposure powers,which were used to collect fluorescence excited by fluorescein embedded in the tapered tips. The experimental results showed that the PTOF generated at 25μW within 5s had better fluorescence collection efficiency, which was about 9.6 times as high as the flat cut fiber.
Tapered fiber is widely used in the field of fluorescence sensing. Among them, the polymer-tipped optical fiber(PTOF) fabricated by free radical photopolymerization has the advantages of flexible fabrication process and low energy consumption.To improve the fluorescence collection characteristics and the sensitivity of the polymer-tipped optical fiber sensor, different sizes of PTOFs were fabricated as sensing heads under different exposure times and exposure powers,which were used to collect fluorescence excited by fluorescein embedded in the tapered tips. The experimental results showed that the PTOF generated at 25μW within 5s had better fluorescence collection efficiency, which was about 9.6 times as high as the flat cut fiber.
引文
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[2]Chu F,Cheng F,Bian Z,et al. Explosive sensing by using polymer tip on the end of optical fiber[J]. Optik-International Journal for Light and Electron Optics,2017,141:10-15.
[3]吴雪梅,董兴法,姜莉.基于拉锥光纤优化的光纤环镜滤波器特性研究[J].激光技术,2015,39(6).
[4]R. Bachelot, S. Blaize, et al., Polymer-tipped optical fibers[J]. Fiber and Integrated Optics. 27(6),542-558(2008).
[5]吴远大.光敏杂化溶胶-凝胶法研制多模干涉波导分束器[J].光电子激光,2010,21(10):1452-1454.
[6]Kenneth G,戴壮,董方田.荧光素及影响其荧光现象的理化因素[J].国外医学:眼科学分册,1984(5):16-22.
[7]Y. Yuan,L. Ding. Theoretical investigation for excitation light and fluorescence signal of fiber optical sensor using tapered fiber tip[J]. Optics Express.19(22),21515-21523(2011).