43 research outputs found
Effect of Energy Conservation Law, Space Dimension, and Problem Symmetry on the Poynting Vector Field Singularities
A brief review is given of the author recent achievements in classifying
singular points of the Poynting vector patterns in electromagnetic fields of
complex configuration. The deep connection between the topological structure of
the force lines pattern and the law of energy conservation, the symmetry of the
problem, and the dimension of the space has been unveiledComment: 12 pages, 8 figure
Nonlinear Pattern Selection in Binary Mixture Convection with Through-Flow
The pattern selection problem in binary-mixture convection in an extended
channel with a lateral through-flow is presented. The through-flow breaks
left--right parity and changes pattern dynamics dramatically. The problem is
studied based on computer simulation of the complete set of hydrodynamic
equations (Oberbeck-Boussinesq approximation) in the two-dimensional
rectangular channel with aspect ratio and convection-suppressing
lateral boundary conditions. A wide variety of new dynamical patterns is
obtained, discussed and classified.Comment: 9 pages and 2 figure
Nature of the Poynting Vector Field Singularities in Resonant Light Scattering by Nanoparticles
Singularities of the Poynting vector field at resonant light scattering by
nanoparticles are discussed and classified. It is shown that there are two
generic types of them, namely (i) the singularities related to the vanishing of
the magnetic (and/or electric) field at the singular points and (ii) the
singularities related to the formation of standing waves in the proximity of
the singular points. The connection of these types of singularities to the
topology of the singular points and the space dimension (3D vs. 2D) is
revealed.Comment: 9 pages, 4 figure
The Poynting vector field generic singularities in resonant scattering of plane linearly polarized electromagnetic waves by subwavelength particles
We present the results of a study of the Poynting vector field generic
singularities at the resonant light scattering of a plane monochromatic
linearly polarized electromagnetic wave by a subwavelength particle. We reveal
the impact of the problem symmetry, the spatial dimension, and the energy
conservation law on the properties of the singularities. We show that, in the
cases when the problem symmetry results in the existence of an invariant plane
for the Poynting vector field lines, a formation of a standing wave in the
immediate vicinity of a singularity gives rise to a saddle-type singular point.
All other types of singularities are associated with vanishing at the singular
points, either (i) magnetic field, for the polarization plane parallel to the
invariant plane, or (ii) electric field, at the perpendicular orientation of
the polarization plane. We also show that in the case of two-dimensional
problems (scattering by a cylinder), the energy conservation law restricts the
types of possible singularities only to saddles and centers in the
non-dissipative media and to saddles, foci, and nodes in dissipative. Finally,
we show that dissipation affects the (i)-type singularities much stronger than
the (ii)-type. The same conclusions are valid for the imaginary part of the
Poynting vector in problems where the latter is regarded as a complex quantity.
The singular points associated with the formation of standing waves are
different for real and imaginary parts of this complex vector field, while all
other singularities are common. We illustrate the general discussion by
analyzing singularities at light scattering by a subwavelength Germanium
cylinder with the actual dispersion of its refractive index.Comment: 20 pages, 3 figures, 2 table