Artículo de revista
Scattering of a surface plasmon polariton by a localized dielectric surface defect
Fecha
2013-04Registro en:
Optics Express, vol. 21, issue 8, p. 9734
DOI:10.1364/OE.21.009734
Autor
Arias Federici, Rodrigo
Maradudin, Alexei A.
Institución
Resumen
On the basis of a rigorous, nonperturbative, purely numerical
solution of the corresponding reduced Rayleigh equation for the scattering
amplitudes we have studied the scattering of a surface plasmon polariton
by a two dimensional dielectric defect on a planar metal surface. The
profile of the defect is assumed to be an arbitrary single-valued function of
the coordinates in the plane of the metal surface, and to be differentiable
with respect to those coordinates. When the defect is circularly symmetric
and the dependence of the scattering amplitudes on the azimuthal angle
is expressed by a rotational expansion, the reduced Rayleigh equation is
transformed into a pair of one-dimensional integral equations for each value
of the rotational quantum number. This approach is applied to a defect in
the form of an isotropic Gaussian function. The differential cross sections
for the scattering of the incident surface plasmon polariton into volume
electromagnetic waves in the vacuum above the surface and into other
surface plasmon polaritons are calculated, as well as the intensity of the field
near the surface. These results differ significantly from the corresponding
results for a metallic defect on a metallic substrate.