Plasmon-enhanced optical trapping of individual metal nanorods

Matthew Pelton, Mingzhao Liu, Kimani C. Toussaint, Hee Y. Kim, Glenna Smith, Jelena Pesic, Philippe Guyot-Sionnest, Norbert F. Scherer

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish (US)
Title of host publicationOptical Trapping and Optical Micromanipulation IV
DOIs
StatePublished - Dec 1 2007
EventOptical Trapping and Optical Micromanipulation IV - San Diego, CA, United States
Duration: Aug 26 2007Aug 29 2007

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6644
ISSN (Print)0277-786X

Other

OtherOptical Trapping and Optical Micromanipulation IV
CountryUnited States
CitySan Diego, CA
Period8/26/078/29/07

Keywords

  • Nanoparticles
  • Optical trapping
  • Plasmons

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

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  • Cite this

    Pelton, M., Liu, M., Toussaint, K. C., Kim, H. Y., Smith, G., Pesic, J., Guyot-Sionnest, P., & Scherer, N. F. (2007). Plasmon-enhanced optical trapping of individual metal nanorods. In Optical Trapping and Optical Micromanipulation IV [66441C] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 6644). https://doi.org/10.1117/12.741857