Kim Jung-Dae, Lee Yong-Gu
Division of Scientific Instrumentation, Korea Basic Science Institute (KBSI).
School of Mechanical Engineering, Gwangju Institute of Science and Technology (GIST);
J Vis Exp. 2017 Apr 4(122):55258. doi: 10.3791/55258.
Plasmonic tweezers use surface plasmon polaritons to confine polarizable nanoscale objects. Among the various designs of plasmonic tweezers, only a few can observe immobilized particles. Moreover, a limited number of studies have experimentally measured the exertable forces on the particles. The designs can be classified as the protruding nanodisk type or the suppressed nanohole type. For the latter, microscopic observation is extremely challenging. In this paper, a new plasmonic tweezer system is introduced to monitor particles, both in directions parallel and orthogonal to the symmetric axis of a plasmonic nanohole structure. This feature enables us to observe the movement of each particle near the rim of the nanohole. Furthermore, we can quantitatively estimate the maximal trapping forces using a new fluidic channel.
表面等离子体镊子利用表面等离子体激元来捕获可极化的纳米级物体。在表面等离子体镊子的各种设计中，只有少数能够观察到固定的粒子。此外，仅有有限数量的研究通过实验测量了作用在粒子上的可施加力。这些设计可分为突出纳米盘型或抑制纳米孔型。对于后者，微观观察极具挑战性。在本文中，我们引入了一种新的表面等离子体镊子系统，用于在与表面等离子体纳米孔结构对称轴平行和正交的方向上监测粒子。这一特性使我们能够观察纳米孔边缘附近每个粒子的运动。此外，我们可以使用一种新的流体通道定量估计最大捕获力。
