Prof. Le-Wei J. Li Profile

Prof. Le-Wei J. Li

at National Univ of Singapore

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Proceedings Article | 28 September 2007 Paper

High energy plasmon resonances of silver nanoparticles

Le-Wei Li, Hao-Yuan She

Proceedings Volume 6642, 664210 (2007) https://doi.org/10.1117/12.737240

KEYWORDS: Optical spheres, Silver, Plasmons, Nanoparticles, Plasmonics, Scattering, Coating, Optical properties, Spherical lenses, Near field

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The behaviors of multiple resonances (or surface plasmon modes) produced by electrically small (the dimension of the sphere is much smaller than the wavelength) metallic nanospheres and coated nanospheres (whose outer radius is much smaller than the wavelength) are addressed in this paper. The plasmon resonances for electrically small nanospheres happen when the real part of the relative plasmon permittivity is near Re[ε_r(ω_n)] = -(n+1)/n, where n = 1, 2, ... The peak values of the scattered field are shown versus the angle of incidence for different n and electrical parameter q (q = k₀a where k₀ denotes the wavenumber in free space and a stands for the radius of the sphere). New formulas for extinction and scattering cross sections for both cases have been derived and given. For coated structures, the situation is a bit more complicated. The scattered field near resonances can be enhanced significantly with small dissipation of the relative permittivity. Within the instrumental error, the spectral range, within which the material Ag has low dissipation so that we can get the greatest scattering energy, is considered for the coated sphere. Two cases, i.e., silver core and coating, are investigated. The relative parameters such as the refractive indices of the core m₁ and the coating m₂, and the volume ratio f (f = a³/b³ where a and b denote the inner and outer radii of the coated sphere) have been derived at resonances. The near field energy intensity distributions around the coated sphere are also shown. The peak value of the scattered energy intensity is given for the lossless cases. This optical property may have potential applications in surface cleaning, etching, nanopatterning and so on.

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Plasmonics: Nanoimaging, Nanofabrication, and Their Applications III

28 August 2007 | San Diego, California, United States

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