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5 September 2007 Plasmon-enhanced optical trapping of individual metal nanorods
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We demonstrate three-dimensional optical trapping and orientation of individual Au nanorods, Au/Ag core/shell nanorods, and Au bipyramids in solution, using the longitudinal surface-plasmon resonance to enhance optical forces. Laser light that is detuned slightly to the long-wavelength side of the resonance traps individual and multiple particles for up to 20 minutes; by contrast, light detuned to the short-wavelength side repels rods from the laser focus. Under stable-trapping conditions, the trapping time of individual particles depends exponentially on laser power, in agreement with a Kramers escape process. Trapped particles have their long axes aligned with the trapping-laser polarization, as evidenced by a suppression of rotational diffusion about the short axis. When multiple particles are trapped simultaneously, evidence of interparticle interactions is observed, including a nonlinearly increasing two-photon fluorescence intensity, increasing fluorescence fluctuations, and changing fluorescence profiles as the trapped particle number increases.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Matthew Pelton, Mingzhao Liu, Kimani C. Toussaint Jr., Hee Y. Kim, Glenna Smith, Jelena Pesic, Philippe Guyot-Sionnest, and Norbert F. Scherer "Plasmon-enhanced optical trapping of individual metal nanorods", Proc. SPIE 6644, Optical Trapping and Optical Micromanipulation IV, 66441C (5 September 2007);

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