42 research outputs found
Nanogroove array on thin metallic film as planar lens with tunable focusing
Numerical results for the distributions of light transmitted through metallic
planar lenses composed of symmetric nanogroove arrays on the surfaces of a gold
film are presented and explained. Both the near- and far-field distributions of
the intensity of light transmitted are calculated by using a Green's function
formalism. Results for an optimal transverse focus based on a quadratic
variation of groove width are obtained. Meanwhile, a significant dependence of
the focal length on the wavelength of light incident from the air side through
the gold film into a dielectric substrate is found for this detector
configuration.Comment: 14 pages, 6 figure
The Design of Random Surfaces with Specified Scattering Properties: Surfaces that Suppress Leakage
We present a method for generating a one-dimensional random metal surface of
finite length L that suppresses leakage, i.e. the roughness-induced conversion
of a surface plasmon polariton propagating on it into volume electromagnetic
waves in the vacuum above the surface. Perturbative and numerical simulation
calculations carried out for surfaces generated in this way show that they
indeed suppress leakage.Comment: Revtex 6 pages (including 4 figures
Random Surfaces that Suppress Single Scattering
We present a method for generating numerically a one-dimensional random
surface, defined by the equation x_3 = \zx, that suppresses single-scattering
processes in the scattering of light from it within a specified range of
scattering angles. Rigorous numerical calculations of the scattering of light
from surfaces generated by this approach show that the single-scattering
contribution to the mean scattered intensity is indeed suppressed within that
range of angles.Comment: 3 pagers (Latex), 3 figure
Design of one-dimensional Lambertian diffusers of light
We describe a method for designing a one-dimensional random surface that acts
as a Lambertian diffuser. The method is tested by means of rigorous computer
simulations and is shown to yield the desired scattering pattern.Comment: 6 pages, 2 figure
Localization of surface plasmon polaritons on a random surface
Abstract We study the possibility of the strong localization of surface plasmon polaritons propagating along a metal surface a "nite part of which is randomly rough. The surface roughness is such that the roughness-induced conversion of a surface plasmon polariton propagating on it into volume electromagnetic waves in the vacuum above the surface is suppressed
Spectral Dependence of Polarized Radiation due to Spatial Correlations
We study the polarization of light emitted by spatially correlated sources.
We show that in general polarization acquires nontrivial spectral dependence
due to spatial correlations. The spectral dependence is found to be absent only
for a special class of sources where the correlation length scales as the
wavelength of light. We further study the cross correlations between two
spatially distinct points that are generated due to propagation. It is found
that such cross correlation leads to sufficiently strong spectral dependence of
polarization which can be measured experimentally.Comment: 5 pages, 4 figure