Near-feld polarization of a plasmonic prolate nanospheroid in a Gaussian beamстатья
Статья опубликована в высокорейтинговом журнале
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 2 апреля 2015 г.
Аннотация:Analytical analysis of the near-eld polarization distribution of a
plasmonic prolate nanospheroid in a Gaussian beam is given. Polarization of the
near-eld is described with the help of the 3D generalized Stokes parameters, allowing
simple visualization. It is shown that for a linearly polarized Gaussian beam with the
lower mode TEM00, which falls perpendicular to the main axis of the nanospheroid,
the only plasmonic mode with n=1; m=0 is excited, which is exactly the case of an
incident plane wave. However, interaction with the Gaussian beam with a transverse
mode of higher order leads to the excitation of the higher order plasmon modes, which
gives much more peculiar distribution. Received analytical solutions cover the whole
set of particles with shape varying from spherical to the nanoneedles and nanorods by
changing the aspect ratio of the spheroid.