Trevisanutto J O, Linhananta A, Das G
Opt Lett. 2016 Dec 15;41(24):5789-5792. doi: 10.1364/OL.41.005789.
The authors demonstrated the fabrication of a fiber Bragg grating-like plasmonic nanostructure on the surface of a tapered optical fiber using gold nanorods (GNRs). A multimode optical fiber with core and cladding diameters of 105 and 125 μm, respectively, was used to make a tapered fiber using a dynamic etching process. The tip diameter was ∼100 nm. Light from a laser was coupled to the untapered end of the fiber, which produced a strong evanescent field around the tapered section of the fiber. The gradient force due to the evanescent field trapped the GNRs on the surface of the tapered fiber. The authors explored possible causes of the GNR distribution. The plasmonic structure will be a good candidate for sensing based on surface enhanced Raman scattering.
作者展示了如何使用金纳米棒（GNRs）在锥形光纤表面制造类似光纤布拉格光栅的等离子体纳米结构。使用动态蚀刻工艺，将芯径和包层直径分别为105μm和125μm的多模光纤制成锥形光纤。尖端直径约为100nm。来自激光器的光耦合到光纤的未变细端，这在光纤的锥形部分周围产生了强烈的倏逝场。倏逝场产生的梯度力将GNRs捕获在锥形光纤表面。作者探究了GNRs分布的可能原因。这种等离子体结构将是基于表面增强拉曼散射的传感的良好候选者。
