1 research outputs found
Radiation Damping of Surface Plasmons in a Pair of Nanoparticles and in Nanoparticles near Interfaces
A theory of surface plasmon radiation damping in a system
of coupled
spherical metallic nanoparticles is developed, and a simple formula
for the radiation line width is obtained for the first time. It is
shown that as a result of surface plasmon frequency redshift, a notable
reduction of the radiation damping rate takes place. For small separations,
the radiation line width narrows by a factor of 3 as compared to large
separations. The theory is expanded to the case of a spherical metallic
nanoparticle placed near an interface of two dielectric media. The
dependence of the redshift of surface plasmon frequency and the radiation
damping rate on the particle–interface separation are calculated.
It is revealed that in both cases, a decrease of refractive index
of the surrounding media also leads to a decrease of the damping rate