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Opt Lett. 2006 Jul 1;31(13):2075-7.

Optical trapping and alignment of single gold nanorods by using plasmon resonances.

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  • 1Department of Physics, James Franck Institute, University of Chicago, Chicago, Illinois 60637, USA.


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.

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