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.
© 2006 Optical Society of America
Original Manuscript: January 24, 2006
Revised Manuscript: March 26, 2006
Manuscript Accepted: April 9, 2006
Vol. 1, Iss. 8 Virtual Journal for Biomedical Optics
Matthew Pelton, Mingzhao Liu, Hee Y. Kim, Glenna Smith, Philippe Guyot-Sionnest, and Norbert F. Scherer, "Optical trapping and alignment of single gold nanorods by using plasmon resonances," Opt. Lett. 31, 2075-2077 (2006)