Two Plasma Resonances in Metal Covered Nanoparticles with Small Dielectric Core
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Date
2013-06
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Addis Ababa University
Abstract
It was generally accepted that metal covered inclusions in a dielectric host matrix have
one maxima of the enhancment factor at one resonant frequency close to the frequency of
the surface plasmon. Recently,Sisay shewamare, V.N.Mal'nev with coauthors have shown
that the local eld in the metal covered nanoinclusion with small dielectric core has two
maxima at two di erent resonant frequencies. The second maxima is not important in
metal covered inclusions with small dielectric cores. But for large metal fractions, the
maxima of the enhancment factor become the same order of magnitude and must be
theken into account.
The aim of this thesis is to check the dependence of the resonant frequencies and the
enhancment factor of the local eld on the parameters of the composite(metal frac-
tion,dielectric function of the core, metal shell, and host matrix) in the spherical in-
clusions. And the second objective of the thesis is to calculate the above mention physical
quantites in the composites with cylinderical inclusions. The account of two maxima of
the enhancment factor of the local eld a ects the linear and non linear optical properties
of the composites metal inclusions having small dielectric cores
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Keywords
Two Plasma Resonances in Metal Covered