Technical University of Denmark, Denmark Technical University Fotonik, Department of Photonics Engineering, Lyngby, Denmark.
Cyprus University of Technology, Nanophotonics Research Group, Department of Electrical Engineering, Computer Engineering and Informatics, Limassol, Cyprus.
J Biomed Opt. 2017 Mar 1;22(3):37003. doi: 10.1117/1.JBO.22.3.037003.
We report on highly accurate femtosecond (fs) laser micromachining of a compound parabolic concentrator (CPC) fiber tip on a polymer optical fiber (POF). The accuracy is reflected in an unprecedented correspondence between the numerically predicted and experimentally found improvement in fluorescence pickup efficiency of a Förster resonance energy transfer-based POF glucose sensor. A Zemax model of the CPC-tipped sensor predicts an optimal improvement of a factor of 3.96 compared to the sensor with a plane-cut fiber tip. The fs laser micromachined CPC tip showed an increase of a factor of 3.5, which is only 11.6% from the predicted value. Earlier state-of-the-art fabrication of the CPC-shaped tip by fiber tapering was of so poor quality that the actual improvement was 43% lower than the predicted improvement of the ideal CPC shape.
我们报告了在聚合物光纤（POF）上使用飞秒（fs）激光对复合抛物面聚光器（CPC）光纤尖端进行高精度微加工。其精度体现在基于Förster 共振能量转移的 POF 葡萄糖传感器的荧光采集效率的数值预测与实验发现之间达到了前所未有的一致性。CPC 尖端传感器的 Zemax 模型预测与平面切割光纤尖端传感器相比，最佳改善因子为 3.96。飞秒激光微加工的 CPC 尖端显示增加了 3.5 倍，仅比预测值低 11.6%。之前通过光纤锥化制作 CPC 形状尖端的最先进工艺质量很差，实际改善比理想 CPC 形状的预测改善低 43%。
