Pelton Matthew, Liu Mingzhao, Kim Hee Y, Smith Glenna, Guyot-Sionnest Philippe, Scherer Norbert F
Department of Physics, James Franck Institute, University of Chicago, Chicago, Illinois 60637, USA.
Opt Lett. 2006 Jul 1;31(13):2075-7. doi: 10.1364/ol.31.002075.
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.
我们通过使用与单个金纳米棒纵向等离子体模式略微失谐的激光，展示了对其进行三维捕获和定向。向共振的长波长侧失谐可实现数分钟的稳定捕获，捕获时间与激光功率呈指数依赖关系（这与克莱默斯逃逸过程一致）。向短波长侧失谐会导致纳米棒从激光焦点处排斥。观察到纳米棒长轴与捕获激光偏振方向的对齐表现为围绕短轴的旋转扩散受到抑制。
