Results 251 to 260 of about 1,160,454 (280)

Accelerating Airy beams with particle-like polarization topologies and free-space bimeronic lattices.

Optics Letters, 2023
Phase and polarization singularities in electromagnetic waves are usually attributed to one-dimensional topologies-lines, knots, and braids. Recently, particle-like structures have been predicted and observed: optical Skyrmions, vortices with spherical ...
J. Berškys, S. Orlov
semanticscholar   +1 more source

Numerical Treatment of Polar Coordinate Singularities

Journal of Computational Physics, 2000
The authors present a method for eliminating the coordinate singularities whereby singular coordinates are redefined so that data are smoothly differentiated through the pole. The method avoids to place a grid point directly at the pole, and consequently eliminates the need for any pole equation.
Mohseni, Kamran, Colonius, Tim
openaire   +2 more sources

On singularity points in elastic orthorhombic media

Second International Meeting for Applied Geoscience & Energy, 2022
The analysis of singularity points in anisotropic models of low symmetry is very important for seismic modelling and seismic data processing. Ray tracing: the group velocity vector dramatically changes the orientation in vicinity of singularity point ...
A. Stovas, Y. Roganov, V. Roganov
semanticscholar   +1 more source

Polarization singularities in optical lattices

Optics Letters, 2004
Polarization singularities are shown to be unavoidable features of three-dimensional optical lattices. These singularities take the form of lines of circular polarization, C lines, and lines of linear polarization, L lines. The polarization figures surrounding a C line (L line) rotate about the line with winding number +/-1/2 (+/-1).
openaire   +2 more sources

Second-harmonic generation of polarization singularities

Optics Letters, 2002
Second-harmonic generation was studied theoretically for the vector singularities (daisy modes) of linearly polarized light and for the elliptic singularities (C points) of elliptically polarized light. Topological charge doubling for C points and daisy modes, similar to that found for vortices, was found.
openaire   +2 more sources

Dynamics of Topological Polarization Singularity in Momentum Space.

Physical Review Letters, 2021
Yixuan Zeng, Guangwei Hu, Kaipeng Liu, Zhixiang Tang, C. Qiu   +4 more
semanticscholar   +1 more source

ON CONTINUATION OF FUNCTIONS WITH POLAR SINGULARITIES

Mathematics of the USSR-Sbornik, 1988
See the review in Zbl 0617.32018.
Sadullaev, A., Chirka, E. M.
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Optical polarization singularities and elliptic stationary points

Optics Letters, 2003
Polarization singularities and elliptic stationary points (collectively, elliptic critical points) were measured experimentally via the complex Stokes field S1 + iS2, where S1 and S2 are Stokes parameters. This new, easily implemented method yielded detailed, high-resolution experimental data for all elliptic critical points.
Marat S, Soskin, Vladimir, Denisenko, Isaac, Freund   +2 more
openaire   +2 more sources

Index of the Polarization Singularity of Poincare Beams

Bulletin of the Russian Academy of Sciences: Physics, 2022
V. Kotlyar, A. Kovalev, S. Stafeev, V. Zaitsev   +3 more
semanticscholar   +1 more source

Generation of V-point polarization singularity array by Dammann gratings

Applied physics B, 2022
J. Desai, K. Gangwar, Ruchi, K. Khare, P. Senthilkumaran   +4 more
semanticscholar   +1 more source