Optical whirlpool on an absorbing metallic nanoparticle
Optical whirlpool on an absorbing metallic nanoparticle
The power-flow lines of light interacting with a metallic nanoparticle, in the proximity of its plasmon resonance, form whirlpool-like nanoscale optical vortices. These vortices were independently observed using analytical Mie theory and 3D finite element numerical modelling of the Maxwell equations. Two different types of vortex have been detected. The outward vortex first penetrates the particle near its centerline then, on exiting the particle, the flow-lines turn away from the centerline and enter a spiral trajectory. Outward vortices are seen for the wavelengths shorter then the plasmon resonance. For the wavelengths longer that the plasmon resonance the vortex is inward: the power-flow lines pass around the sides of the particle before turning towards the centerline and entering the particle to begin their spiral trajectory.
nanoparticle optical vortex plasmon resonance
8372-8379
Bashevoy, M.V.
b9c00e78-fd59-4243-a369-f29dd08061fd
Fedotov, V.A.
3725f5cc-2d0b-4e61-95c5-26d187c84f25
Zheludev, N.I.
32fb6af7-97e4-4d11-bca6-805745e40cc6
17 October 2005
Bashevoy, M.V.
b9c00e78-fd59-4243-a369-f29dd08061fd
Fedotov, V.A.
3725f5cc-2d0b-4e61-95c5-26d187c84f25
Zheludev, N.I.
32fb6af7-97e4-4d11-bca6-805745e40cc6
Bashevoy, M.V., Fedotov, V.A. and Zheludev, N.I.
(2005)
Optical whirlpool on an absorbing metallic nanoparticle.
Optics Express, 13 (21), .
(doi:10.1364/OPEX.13.008372).
Abstract
The power-flow lines of light interacting with a metallic nanoparticle, in the proximity of its plasmon resonance, form whirlpool-like nanoscale optical vortices. These vortices were independently observed using analytical Mie theory and 3D finite element numerical modelling of the Maxwell equations. Two different types of vortex have been detected. The outward vortex first penetrates the particle near its centerline then, on exiting the particle, the flow-lines turn away from the centerline and enter a spiral trajectory. Outward vortices are seen for the wavelengths shorter then the plasmon resonance. For the wavelengths longer that the plasmon resonance the vortex is inward: the power-flow lines pass around the sides of the particle before turning towards the centerline and entering the particle to begin their spiral trajectory.
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oe-13-21-8372
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Published date: 17 October 2005
Keywords:
nanoparticle optical vortex plasmon resonance
Identifiers
Local EPrints ID: 28680
URI: http://eprints.soton.ac.uk/id/eprint/28680
ISSN: 1094-4087
PURE UUID: cfd8de55-6342-47e1-abe8-59eaa5a8a17d
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Date deposited: 03 May 2006
Last modified: 16 Mar 2024 02:43
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Author:
M.V. Bashevoy
Author:
V.A. Fedotov
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