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Optical forces on interacting plasmonic nanoparticles in a focused Gaussian beam

Li, Zhipeng; Käll, Mikael and Xu, Hongxing LU (2008) In Physical Review B (Condensed Matter and Materials Physics) 77(8). p.6-085412
Abstract
We theoretically analyze optical forces on aggregates of metal nanoparticles in a focused Gaussian beam by extending the generalized Mie theory, which includes higher order multipoles and retardation effects. For two interacting metallic particles, an attractive gradient force, mainly caused by multipole plasmon excitation, exists at short interparticle distances, while induced dipolar fields dominate for separations of the order of the particle radius R or larger. The long-range force component can be either attractive or repulsive depending on the phase of the induced dipoles, as determined by the illumination wavelength and the collective dipolar plasmon resonance. In particular, the repulsive force that occurs for illumination near the... (More)
We theoretically analyze optical forces on aggregates of metal nanoparticles in a focused Gaussian beam by extending the generalized Mie theory, which includes higher order multipoles and retardation effects. For two interacting metallic particles, an attractive gradient force, mainly caused by multipole plasmon excitation, exists at short interparticle distances, while induced dipolar fields dominate for separations of the order of the particle radius R or larger. The long-range force component can be either attractive or repulsive depending on the phase of the induced dipoles, as determined by the illumination wavelength and the collective dipolar plasmon resonance. In particular, the repulsive force that occurs for illumination near the plasmon resonance wavelength can be so large that it overcomes the optical trapping effect of the Gaussian beam. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B (Condensed Matter and Materials Physics)
volume
77
issue
8
pages
6 - 085412
publisher
American Physical Society
external identifiers
  • wos:000253764300095
  • scopus:40849131044
ISSN
1098-0121
DOI
10.1103/PhysRevB.77.085412
language
English
LU publication?
yes
id
aecba873-44fa-46d5-a3fc-483289f6b1b9 (old id 1185899)
date added to LUP
2008-09-03 11:12:19
date last changed
2017-08-27 04:55:29
@article{aecba873-44fa-46d5-a3fc-483289f6b1b9,
  abstract     = {We theoretically analyze optical forces on aggregates of metal nanoparticles in a focused Gaussian beam by extending the generalized Mie theory, which includes higher order multipoles and retardation effects. For two interacting metallic particles, an attractive gradient force, mainly caused by multipole plasmon excitation, exists at short interparticle distances, while induced dipolar fields dominate for separations of the order of the particle radius R or larger. The long-range force component can be either attractive or repulsive depending on the phase of the induced dipoles, as determined by the illumination wavelength and the collective dipolar plasmon resonance. In particular, the repulsive force that occurs for illumination near the plasmon resonance wavelength can be so large that it overcomes the optical trapping effect of the Gaussian beam.},
  author       = {Li, Zhipeng and Käll, Mikael and Xu, Hongxing},
  issn         = {1098-0121},
  language     = {eng},
  number       = {8},
  pages        = {6--085412},
  publisher    = {American Physical Society},
  series       = {Physical Review B (Condensed Matter and Materials Physics)},
  title        = {Optical forces on interacting plasmonic nanoparticles in a focused Gaussian beam},
  url          = {http://dx.doi.org/10.1103/PhysRevB.77.085412},
  volume       = {77},
  year         = {2008},
}