Optical forces on interacting plasmonic nanoparticles in a focused Gaussian beam
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1185899
- author
- Li, Zhipeng ; Käll, Mikael and Xu, Hongxing LU
- organization
- publishing date
- 2008
- 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
- 2016-04-01 14:34:14
- date last changed
- 2022-01-28 01:19:26
@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}},
doi = {{10.1103/PhysRevB.77.085412}},
volume = {{77}},
year = {{2008}},
}