Three-dimensional manipulation with scanning near-field optical nanotweezers
Three-dimensional manipulation with scanning near-field optical nanotweezers
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DOI：
10.1038/nnano.2014.24
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发表时间：
2014-04-01
影响因子：
38.3
通讯作者：
Quidant, R.
中科院分区：
文献类型：
--
作者：
Berthelot, J.;Acimovic, S. S.;Quidant, R.
纳米技术的最新进展促使人们需要工具来准确和非侵入性地操纵单个纳米物体（1）。在可能的策略中，光学力已经被预测为研究人员提供了能够捕获样品并在三维空间中移动的纳米光镊（2-4）。然而，在实践中，微弱的光学力和光热问题的结合迄今为止阻止了它们的实验实现。在这里，我们展示了第一个三维光学操纵的单个50 nm的电介质对象与近场纳米镊子。纳米光学陷阱是通过在锥形金属涂层光纤的末端设计蝴蝶结等离子体孔径来构建的。捕获操作和监测都是通过光纤进行的，使这些纳米镊子完全自主，没有笨重的光学元件。所实现的捕获性能允许被捕获的样品在几分钟的时间内以非常低的陷阱强度移动数十微米。这种非侵入性的方法被预见到在纳米科学中打开新的视野，通过提供对纳米尺寸的物体，包括热敏生物标本的前所未有的控制水平。
Recent advances in nanotechnologies have prompted the need for tools to accurately and non-invasively manipulate individual nano-objects(1). Among the possible strategies, optical forces have been predicted to provide researchers with nano-optical tweezers capable of trapping a specimen and moving it in three dimensions(2-4). In practice, however, the combination of weak optical forces and photothermal issues has thus far prevented their experimental realization. Here, we demonstrate the first three-dimensional optical manipulation of single 50 nm dielectric objects with near-field nanotweezers. The nano-optical trap is built by engineering a bowtie plasmonic aperture at the extremity of a tapered metal-coated optical fibre. Both the trapping operation and monitoring are performed through the optical fibre, making these nanotweezers totally autonomous and free of bulky optical elements. The achieved trapping performances allow for the trapped specimen to be moved over tens of micrometres over a period of several minutes with very low in-trap intensities. This non-invasive approach is foreseen to open new horizons in nanosciences by offering an unprecedented level of control of nanosized objects, including heat-sensitive biospecimens.