Results 261 to 270 of about 538,294 (297)
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2020
<p><span>The Martian winter polar vortex </span><span>has recently been shown to be</span><span> annular in nature, with a local minimum in potential vorticity near the pole. This suggests barotropic instability, yet the vortex is remarkably persistent.
Emily Ball +4 more
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<p><span>The Martian winter polar vortex </span><span>has recently been shown to be</span><span> annular in nature, with a local minimum in potential vorticity near the pole. This suggests barotropic instability, yet the vortex is remarkably persistent.
Emily Ball +4 more
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Vortex polarization states in nanoferroelectrics
2010 Conference on Optoelectronic and Microelectronic Materials and Devices, 2010Two-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 +7 more
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Controllable vortex polarity switching by spin polarized current
Journal of Applied Physics, 2009Nanopillars 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 +3 more
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The stratospheric polar vortex in winter
Journal of Geophysical Research, 1959In winter the polar stratospheric air within the earth's shadow forms the core of an intense ‘cold low’ which extends from about 10 km to at least 50 km and possibly to the base of the ionosphere. Compared with the tropospheric general circulation, this vortex seems to be remarkably stable, particularly in the Southern Hemisphere.
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Tight focusing of elliptically polarized vortex beams
Applied Optics, 2009We 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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Polarization-vortex-driven second-harmonic generation
Optics Letters, 2003Polarization 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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Vortex polarization dynamics in a square magnetic nanodot
Journal of Physics: Condensed Matter, 2013Langevin simulations at finite temperature of two-dimensional magnetic nanodots were performed using the Landau-Lifshitz equation with exchange and dipolar interactions. In a wide range of temperatures, the dynamics of square samples with one central vortex was studied, focusing on the out-of-plane magnetic component at the vortex-core.
Depondt, Philippe +2 more
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Directional polarization vortex nanofocusing with a plasmonic lens
Applied OpticsThe plasmonic lens, enabling researchers to focus the input light to a specific spatial position in the form of surface plasmon polaritons, is attracting much interest benefiting from the tight focusing and nanoscale confinement of light.
Yujie Zhou, Hailong Zhou, Dongzhi Fu
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