Results 261 to 270 of about 84,860 (301)

Polarization-vortex-driven second-harmonic generation

Optics Letters, 2003
Polarization vortices exist in the focus of a class of vector beams, the lowest order of which possess full vector symmetry about the axis of propagation of the beam. At high numerical apertures these beams are known to exhibit large, local, longitudinal fields in the focal region.
D P, Biss, T G, Brown
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Polarization holography for vortex retarders recording

Applied Optics, 2013
We present an original static recording method for vortex retarders (VRs) made from liquid crystal polymers (LCPs) using the superimposition of several polarized beams. VRs are birefringent plates characterized by a rotation of their fast axis about their center. The new method is based on polarization holography and photo-orientable LCP.
Piron, Pierre, Blain, Pascal, Mawet, Dimitri, Habraken, Serge   +3 more
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Polarization basis for vortex beams

Journal of the Optical Society of America A, 2001
Attention is called to a polarization basis formed by four Jones vectors that is reducible to two basic structures. In these states the field is linearly polarized at any point, but the polarization direction changes with the angular coordinate. Very simple equations hold for the field lines of these basis vectors.
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Ozone decrease outside Arctic polar vortex due to polar vortex processing in 1997

Journal of Geophysical Research: Atmospheres, 2006
We examine the effect of polar vortex processing on ozone concentrations outside the 1997 Arctic polar vortex. The Arctic vortex in this year was well isolated, cold, and circumpolar, and it broke up unusually late. However, time threshold diagnostics (TTD) analysis using a middle vortex boundary defined by the first derivative of the equivalent ...
H. Akiyoshi, S. Sugata, M. Yoshiki, T. Sugita   +3 more
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Polarization out of the vortex

Nature Physics, 2021
The virtual photons that are exchanged when a free-electron vortex beam interacts with a nanoscopic target unlock an explicit connection between polarized optical spectroscopy and the inelastic scattering of scalar electron waves.
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Vortex Tangle Polarized by Rotation

Journal of Low Temperature Physics, 2004
Almost all studies of vortex states in superfluid 4He have been concerned with either ordered vortex arrays driven by rotation or disordered vortex tangles driven, for example, by thermal counterfiow. In this work we study numerically what happens to vortices in the presence of both effects.
Tsubota M, Barenghi CF, Araki T
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Controllable vortex polarity switching by spin polarized current

Journal of Applied Physics, 2009
Nanopillars containing a perpendicular polarizer and a vortex free layer have been considered as promising structures for the selective switching of the vortex core by changing the spin polarized current direction. In this paper, two distinct switching routes of the vortex cores are found to be classified according to the lateral dimension of samples ...
Wei Jin, Huan He, Yuguang Chen, Yaowen Liu   +3 more
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Vortex polarization states in nanoferroelectrics

2010 Conference on Optoelectronic and Microelectronic Materials and Devices, 2010
Two-dimensional arrays of ferroelectric lead zirconate titanate (PZT) nanodots fabricated using pulsed laser deposition (PLD) through ultrathin anodic aluminum oxide (AAO) membrane stencil masks have been investigated using piezoresponse force microscopy (PFM).
B.J. Rodriguez, X.S. Gao, L.F. Liu, W. Lee, I.I. Naumov, A.M. Bratkovsky, D. Hesse, M. Alexe   +7 more
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Tight focusing of elliptically polarized vortex beams

Applied Optics, 2009
We study the focusing properties of elliptically polarized vortex beams. Based on vectorial Debye theory, some numerical calculations are given to illustrate the intensity and phase distribution properties of tightly focused vortex beams. It is found that the spin angular momentum of the elliptically polarized vortex beam will convert to orbital ...
Baosuan, Chen, Jixiong, Pu
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Properties of circularly polarized vortex beams

Optics Letters, 2006
The properties of circularly polarized vortex beams in cylindrical polarization bases are studied. A circularly polarized vortex beam is decomposed into radial and azimuthal polarization. With the proper combination of vortex charge and the handedness of the circular polarization, a focal field with an extremely strong longitudinal component as well as
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