Results 261 to 270 of about 54,067 (294)

Using Atmospheric Polarization Patterns for Azimuth Sensing

SPIE Proceedings, 2014
Unpolarized light from the Sun incident upon the Earth’s atmosphere becomes polarized and presents a polarization pattern in the viewable sky dome that depends on the position of the Sun, the viewer’s position on the Earth, and the time of the observation. In clear and slightly overcast skies, both the degree of linear polarization and the polarization
Todd M. Aycock, Art Lompado, Benjamin M. Wheeler   +2 more
openaire   +1 more source

Ultra broad slant polarized omni azimuthal antenna

Proceedings of IEEE Antennas and Propagation Society International Symposium, 2002
A slant polarized omni azimuthal antenna covering 2 to 26 GHz (13:1 frequency bandwidth) has been designed and developed using only three layers of printed circuit polarizers. The design approach and performance optimization of the antenna are discussed.
A. Kumar, R. Pal, V.C. Misra
openaire   +1 more source

Ultra Compact Metasurface Radial/Azimuthal Polarization Converter

Frontiers in Optics 2015, 2015
We demonstrate the generation of radially and azimuthally polarized beams using an ultra compact metasurface. The metasurface is composed of an array of gap plasmon resonators with distinct orientation angles.
Zeyu Lei, Tian Yang
openaire   +1 more source

Laser resonator supporting a nondiffracting, azimuthally polarized mode

Optics Letters, 2012
We analyze the lowest-order mode supported by a laser resonator containing an intra-cavity transmissive axicon using the Fox-Li iteration algorithm. Two configurations were considered. By proper choice of the cavity dimensions, the lowest-order mode is nondiffracting and azimuthally polarized. The mode pattern at the output coupler is a Bessel function
openaire   +2 more sources

Subwavelength focusing of azimuthally polarized optical vortex

Optical Technologies in Telecommunications 2017, 2018
In this work, we numerically investigated focusing of a quasi-cylindrical optical vortex with azimuthal polarization and a wavelength of 532 nm. It was shown that the focal spot produced by a beam with four sectors focused with a Fresnel zone plate with a numerical aperture of NA = 0.95 does not differ from the ideally azimuthally polarized optical ...
Victor V. Kotlyar, Maria V. Kotlyar, Liam O'Faolain, Anton G. Nalimov, Sergey S. Stafeev   +4 more
openaire   +1 more source

Fiber based generation of azimuthally polarized light

SPIE Proceedings, 2012
We report on a novel approach for the generation of radially and azimuthally polarized light employing a fiber mode filter. The mode filter consists of a Fiber Bragg Grating written in a strongly guiding fiber with lifted modal degeneracy. These kinds of fibers guide radially and azimuthally polarized modes with non-degenerated, i.e.
Christoph Jocher, Cesar Jauregui, Christian Voigtländer, Fabian Stutzki, Stefan Nolte, Jens Limpert, Andreas Tünnermann   +6 more
openaire   +1 more source

Radial and azimuthal polarized vector Bessel beams

Frontiers in Optics 2014, 2014
We experimentally investigate generation, self-healing, and application of radial and azimuthal polarized vector Bessel beams. Vector Bessel beams can self-heal their intensity and spatially inhomogeneous state of polarization. Applications in optical trapping are discussed.
Giovanni Milione, T. A. Nguyen, R. R. Alfano, D. B. Ruffner, D. G. Grier, A. Dudley, A. Forbes, E. Karimi, S. Slussarenko, L. Marrucci   +9 more
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Efficient extracavity generation of radially and azimuthally polarized beams

Optics Letters, 2007
We demonstrate an efficient transformation of a linearly polarized Gaussian beam to a radially or an azimuthally polarized doughnut (0,1)* Laguerre-Gaussian beam of high purity. We use a spatially variable retardation plate, composed of eight sectors of a lambda/2 retardation plate, to transform a linear polarization distribution to radial/azimuthal ...
G, Machavariani, Y, Lumer, I, Moshe, A, Meir, S, Jackel   +4 more
openaire   +2 more sources

Geometrical phase and surface plasmon focusing with azimuthal polarization

Optics Letters, 2012
Owing to a geometric phase effect, an isosceles triangular aperture etched into thin metal film leads to constructive or destructive interference of surface plasmons excited at the two equal sides under linearly polarized illumination. Through appropriate spatial arrangement of an array of triangles, a highly confined focal spot beyond the diffraction ...
Weibin, Chen, Robert L, Nelson, Qiwen, Zhan   +2 more
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Vertically Polarized 360° Azimuth Scanning Array

IEEE Antennas and Wireless Propagation Letters, 2022
Jiadong Hu, Yue Li, Zhijun Zhang
openaire   +1 more source