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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 2, Iss. 11 — Nov. 26, 2007

Nanometric control of the distance between plasmonic nanoparticles using optical forces

B. Sepulveda, J. Alegret, and M. Käll  »View Author Affiliations

Optics Express, Vol. 15, Issue 22, pp. 14914-14920 (2007)

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We theoretically analyze the optical forces between two nearby silver nanoparticles for the case when the wavelength of the incoming light is close to the localized surface plasmon resonance (LSPR). It is shown that the optical force between the nanoparticles is enhanced by the LSPR and that it changes from attractive to repulsive for wavelengths slightly shorter than the resonance when the polarization of the incident light is parallel to the axis of the dimer. This behavior can be utilized to generate a stable separation distance between the nanoparticles. In the Rayleigh limit, the equilibrium distance is uniquely determined by the real part of the particle polarizability and the wavelength of the incident light. The results suggest that near-field optical forces can be used to manipulate and organize plasmonic nanoparticles with a tunable spatial resolution in the nanometer regime.

© 2007 Optical Society of America

OCIS Codes
(020.7010) Atomic and molecular physics : Laser trapping
(170.4520) Medical optics and biotechnology : Optical confinement and manipulation
(290.5870) Scattering : Scattering, Rayleigh

ToC Category:

Original Manuscript: September 6, 2007
Revised Manuscript: September 26, 2007
Manuscript Accepted: September 26, 2007
Published: October 26, 2007

Virtual Issues
Vol. 2, Iss. 11 Virtual Journal for Biomedical Optics

B. Sepúlveda, J. Alegret, and M. Käll, "Nanometric control of the distance between plasmonic nanoparticles using optical forces," Opt. Express 15, 14914-14920 (2007)

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