Trapping and rotating nanoparticles using a plasmonic nano-tweezer with an integrated heat sink
Trapping and rotating nanoparticles using a plasmonic nano-tweezer with an integrated heat sink
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DOI：
10.1038/ncomms1480
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发表时间：
2011-09-01
影响因子：
16.6
通讯作者：
Crozier, Kenneth B.
中科院分区：
文献类型：
--
作者：
Wang, Kai;Schonbrun, Ethan;Crozier, Kenneth B.
虽然基于远场的光镊已经被证明在操纵大于光波长的物体方面非常成功，但由于衍射限制的聚焦光斑尺寸，它们在纳米尺度上面临困难。这激发了人们对用等离子体纳米结构捕获粒子的兴趣，因为它们能够将强场限制在亚波长尺寸。然而，等离子体的一个基本问题是欧姆损耗，这导致在其中执行捕获的水被加热并导致热对流。在这里，我们展示了使用模板剥离等离子体纳米柱结合散热器的纳米粒子的捕获和旋转。我们的模拟预测，与以前的设计相比，加热减少了100倍。我们进一步证明了聚苯乙烯颗粒的稳定捕获，直径小至110 nm，可以围绕纳米柱主动旋转，通过手动旋转入射线性偏振，或被动地，使用圆偏振照明。
Although optical tweezers based on far-fields have proven highly successful for manipulating objects larger than the wavelength of light, they face difficulties at the nanoscale because of the diffraction-limited focused spot size. This has motivated interest in trapping particles with plasmonic nanostructures, as they enable intense fields confined to sub-wavelength dimensions. A fundamental issue with plasmonics, however, is Ohmic loss, which results in the water, in which the trapping is performed, being heated and to thermal convection. Here we demonstrate the trapping and rotation of nanoparticles using a template-stripped plasmonic nanopillar incorporating a heat sink. Our simulations predict an similar to 100-fold reduction in heating compared with previous designs. We further demonstrate the stable trapping of polystyrene particles, as small as 110 nm in diameter, which can be rotated around the nanopillar actively, by manual rotation of the incident linear polarization, or passively, using circularly polarized illumination.