Optical trapping and alignment of single gold nanorods by using plasmon resonances
Optical trapping and alignment of single gold nanorods by using plasmon resonances
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DOI：
10.1364/ol.31.002075
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发表时间：
2006-07-01
期刊：
影响因子：
3.6
通讯作者：
Scherer, Norbert E.
中科院分区：
文献类型：
--
作者：
Pelton, Matthew;Liu, Mingzhao;Scherer, Norbert E.
我们使用与其纵向等离子激元模式略有失谐的激光，演示了单个Au纳米棒的三维陷阱和取向。失谐到共振的长波长侧可以稳定地捕获几分钟，捕获时间与激光功率呈指数关系(与克莱默逃逸过程一致)。调谐到短波长侧会引起棒对激光焦点的排斥。观察到棒的长轴与俘获激光偏振的对准是对围绕短轴的旋转扩散的抑制。(C)2006年美国光学学会。
We demonstrate three-dimensional trapping and orientation of individual Au nanorods by using laser light slightly detuned from their longitudinal plasmon mode. Detuning to the long-wavelength side of the resonance allows stable trapping for several minutes, with an exponential dependence of trapping time on laser power (consistent with a Kramer's escape process). Detuning to the short-wavelength side causes repulsion of the rods from the laser focus. Alignment of the long axis of the rods with the trapping laser polarization is observed as a suppression of rotational diffusion about the short axis. (c) 2006 Optical Society of America.