Guided transport of nanoparticles by plasmonic nanowires
Guided transport of nanoparticles by plasmonic nanowires
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通过等离子体纳米线引导纳米粒子的传输
DOI：
10.1039/c6nr07490a
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发表时间：
2016
期刊：
影响因子：
6.7
通讯作者：
Xu Hongxing
中科院分区：
文献类型：
--
作者：
Yang Cui;Pan Deng;Tong Lianming;Xu Hongxing
在这里，我们报告的光捕获和定向传输的纳米粒子在水溶液中的等离子体纳米线。激光照射银纳米线的一端，激发局域化和传播的表面等离子体。表面等离子体激元诱导的光力可以将纳米颗粒捕获在水溶液中。有趣的是，被捕获的纳米颗粒沿着沿着银纳米线从捕获位置移动到激光的激发点。在弯曲的纳米线上也观察到纳米颗粒的这种运动，其中颗粒的轨迹由纳米线的形状明确确定。更重要的是，对于V形银纳米线，运动的方向可以通过入射激光的偏振来调制。运动的方向与由表面等离子体激元传播引起的散射力的预测相反，并且驱动力可能涉及由于加热效应引起的局部流体的热对流。我们的研究结果表明，一种新的方法来传输纳米粒子的等离子体波导在水溶液中。
Herein, we report the optical trapping and directional transport of nanoparticles in an aqueous solution by plasmonic nanowires. A laser illuminated one end of a silver nanowire and excited the localized and propagating surface plasmons. Optical forces were induced by the surface plasmons, which could trap the nanoparticles in an aqueous solution. Interestingly, the trapped nanoparticles moved along the silver nanowires from the trapping site to the excitation spot of the laser. Such movements of nanoparticles were also observed on curved nanowires, in which the trajectories of the particles were explicitly determined by the shape of the nanowires. More importantly, for a V-shaped silver nanowire, the direction of the movement could be modulated by the polarization of the incident laser. The direction of the movement was opposite to the prediction by the scattering force due to the propagation of surface plasmons, and the driving force could involve the thermal convection of local fluid due to a heating effect. Our findings indicate a novel approach to transport nanoparticles by plasmonic waveguides in aqueous solution.