Selective aggregation of single-walled carbon nanotubes using the large optical field gradient of a focused laser beam
Selective aggregation of single-walled carbon nanotubes using the large optical field gradient of a focused laser beam
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DOI：
10.1103/physrevlett.101.127402
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发表时间：
2008-09-19
影响因子：
8.6
通讯作者：
Kawata, Satoshi
中科院分区：
文献类型：
--
作者：
Rodgers, Thomas;Shoji, Satoru;Kawata, Satoshi
我们利用激光通过大数值孔径物镜聚焦的大光场梯度，演示了单壁碳纳米管在光子力作用下的选择性聚集。这些纳米管分散在含有表面活性剂的水溶液中，通过从光学陷阱的共焦体积进行拉曼散射来检测。通过使用可见光激光进行捕获和探测，以短间隔获取的径向呼吸模式信号的动力学显示随着时间的推移单一呼吸模式增加，表明焦点体积中只有一种管的密度增加。这一结果代表着朝着通过光场对纳米管进行任意操纵和分类的技术的发展迈出了重要的一步。
We demonstrate the selective aggregation of single-walled carbon nanotubes by photon forces, using the large optical field gradient of a laser focused through a high numerical aperture objective lens. The nanotubes, dispersed in an aqueous solution with a surfactant, are detected via Raman scattering from the confocal volume of the optical trap. By using a visible-light laser for both trapping and detection, the dynamics of the radial breathing mode signal taken at short intervals shows an increase of a single breathing mode over time, indicating the increase in the density of only one species of tube in the focal volume. This result represents a significant step toward the development of techniques for the arbitrary manipulation and sorting of nanotubes by optical fields.