Plasmonic random nanostructures on fiber tip for trapping live cells and colloidal particles
Plasmonic random nanostructures on fiber tip for trapping live cells and colloidal particles
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DOI：
10.1364/ol.40.003926
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发表时间：
2015-09-01
期刊：
影响因子：
3.6
通讯作者：
Ho, Ho-Pui
中科院分区：
文献类型：
--
作者：
Chen, Jiajie;Kang, Zhiwen;Ho, Ho-Pui
我们演示了由980 nm激光辐射激发的镀金单模光纤尖端上的光捕获。这里的捕获力不是由于常见的等离子体局域化，而是由热泳和热对流的组合效应主导的。报道的方案只需要简单的薄膜沉积。更重要的是，金随机纳米结构的有效宽带等离子体吸收，在来自纤芯的纯高斯激发分布的帮助下，导致了非常低的捕获功率阈值，通常为数百微瓦。这种高度通用的基于纤维的捕获方案显然在生命科学和工程学科中提供了许多潜在的应用可能性。(C)2015美国光学学会
We demonstrate optical trapping on a gold-coated single-mode fiber tip as excited by 980-nm laser radiation. The trapping force here is not due to common plasmonic localization, but dominated by the combined effect of thermophoresis and thermal convection. The reported scheme only requires simple thin-film deposition. More importantly, efficient broadband plasmonic absorption of the gold random nanostructures, aided by purely Gaussian excitation profile from the fiber core, has led to very low trapping-power threshold typically in hundreds of microwatts. This highly versatile fiber-based trapping scheme clearly offers many potential application possibilities in life sciences as well as engineering disciplines. (C) 2015 Optical Society of America