Results 241 to 250 of about 1,160,454 (280)

Emergent polarization singularities

Optics Letters, 2004
Polarization singularities are shown to emerge spontaneously from the incoherent addition of uncorrelated optical fields that individually need not contain singularities. Examples of this phenomenon are given for both vector and ellipse fields. The incoherent addition of vector fields whose singularities have integer winding numbers is shown to yield ...
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Evolution of Topological Polarization Singularity in a Photonic Crystal Slab

Laser & Photonics Reviews
The polarization singularity in momentum space, known as a new type of topological defect, has garnered tremendous attention across the nanophotonic community. Bound states in the continuum (BICs) and unidirectional guided resonances (UGRs) in a photonic
Lujun Huang, Andrey E. Miroshnichenko
semanticscholar   +1 more source

Tunable polarization singularity array enabled using superposition of vector curvilinear beams

Applied Physics Letters, 2019
In this paper, we present an approach for creating a polarization singularity array (PSA) along a curvilinear structure by exploring a scheme of coaxially superposing pre-designed component vector beams.
Chenliang Chang, Lin Li, Yuan Gao, Shou-Ping Nie, Zhi-Cheng Ren, Jianping Ding, Huitian Wang   +6 more
semanticscholar   +1 more source

Polychromatic polarization singularities

Optics Letters, 2003
Elliptical polarization can appear in only monochromatic optical fields. In polychromatic vector fields the polarization is a Lissajous figure, but in only commensurate fields do the figures have well-defined shapes; in other fields the shapes are undefined.
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Topological Polarization Singularity Modulation in the Phase Change Material Metasurfaces

IEEE Photonics Technology Letters
Polarization singularities have garnered significant attention due to their special properties and can be modulated by reducing the symmetry of the structure. At present, the regulation of polarization singularity is usually passive, and the polarization
Haoxuan He, Lulu Wang, Hong Duan, Xia Yan, Ying Zhang, Shengyun Luo, Yingfei Yi, Chaobiao Zhou   +7 more
semanticscholar   +1 more source

Polarization rotation and singularity evolution of fundamental Poincaré beams through anisotropic Kerr nonlinearities

Journal of Optics, 2020
We report a theoretical investigation on polarization rotation and singularity evolution of focused fundamental Poincaré beams in free-space propagation and through isotropic and anisotropic Kerr nonlinear media. It is found that the optical nonlinearity
Bo Wen, Guanghao Rui, J. He, Yiping Cui, B. Gu   +4 more
semanticscholar   +1 more source

Singular points of the polarization tensor

Solar Physics, 1996
The problem to compute the magnetic field above the chromosphere using data of the vector τ = B t /B t that gives the projected field direction can be solved with different approximations. The field of direction vectors τ is, however, not the only field accessible to observations. The Stokes parameters, which are components of the radiation tensor, can
M. M. Molodensky, L. I. Starkova
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Polarization filter with singular value decomposition

GEOPHYSICS, 2001
We present a singular value decomposition (SVD) based algorithm for polarization filtering of triaxial seismic recordings based on the assumption that the particle motion trajectory is essentially 2-D (elliptical polarization). The filter is the sum of the first two eigenimages of the SVD on the signal matrix.
De Franco R, Musacchio G
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Skyrmionic Polarization Texture around the Phase Singularity of Optical Vortices.

Physical Review Letters
We disclose the existence of a type of optical skyrmion, Gauss-Stokes (GS) skyrmions, that is naturally present in an optical vortex around its phase singularity.
Nilo Mata-Cervera, Deepak K. Sharma, Yijie Shen, Ramon Paniagua-Dominguez, Miguel A. Porras   +4 more
semanticscholar   +1 more source

Impact of various mechanisms of the photorefractive effect on polarization singularity generation during the self-focusing of a Gaussian beam in an isotropic medium

Journal of the Optical Society of America B, 2019
The emerging of polarization singularity lines (C-lines), accompanying the self-focusing of an initially elliptically polarized Gaussian beam in an isotropic medium with various mechanisms of cubic nonlinearity, is studied numerically.
K. Grigoriev, V. Makarov
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