Dipole and quadrupole surface plasmon resonance contributions in formation of near-field images of a gold nanosphere

Multipolar plasmon optical excitations at spherical gold nanoparticles and their manifestations in the particle images formatted in the particle surface proximity are studied. The multipolar plasmon size characteristic: plasmon resonance frequencies and plasmon damping rates were obtained within rig...

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Bibliographic Details
Published in:Opto-electronics review 2010, Vol.18 (4), p.421-428
Main Authors: Shopa, M., Kolwas, K., Derkachova, A., Derkachov, G.
Format: Article
Language:English
Subjects:
gold nanoparticles
Lasers
Materials Science
Mie theory
multipolar surface plasmon resonances
Nanophotonics
Nanotechnology
near-field imaging
NSOM
Optical and Electronic Materials
Optical Devices
optical properties of noble metal nanospheres
Optics
Photonics
Physics
Physics and Astronomy
plasmonic nanostructures
plasmonics
PSTM
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Summary:Multipolar plasmon optical excitations at spherical gold nanoparticles and their manifestations in the particle images formatted in the particle surface proximity are studied. The multipolar plasmon size characteristic: plasmon resonance frequencies and plasmon damping rates were obtained within rigorous size dependent modelling. The realistic, frequency dependent dielectric function of a metal was used. The distribution of light intensity and of electric field radial component at the flat square scanning plane scattered by a gold sphere of radius 95 nm was acquired. The images resulted from the spatial distribution of the full mean Poynting vector including near-field radial components of the scattered electromagnetic field. Monochromatic images at frequencies close to and equal to the plasmon dipole and quadrupole resonance frequencies are discussed. The changes in images and radial components of the scattered electromagnetic field distribution at the scanning plane moved away from the particle surface from near-field to far-field region are discussed.
ISSN:1230-3402
1896-3757
1896-3757
DOI:10.2478/s11772-010-0047-2