Results 261 to 270 of about 26,202 (305)
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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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Generation of broadband terahertz vortex beams
Optics Letters, 2014We propose and demonstrate a method for generating broadband terahertz (THz) vortex beams. We convert a THz radially polarized beam into a THz vortex beam via achromatic polarization optical elements for THz waves and characterize the topological charge of the generated vortex beam by measuring the spatial distribution of the phase of the THz wave at ...
Ryo, Imai +4 more
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Vortex generation reaches a new plateau
Science, 2017Surface engineering provides a powerful platform for vortex and structured wave ...
Cheng-Wei, Qiu, Yuanjie, Yang
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Generation of perfect vectorial vortex beams
Optics Letters, 2016We propose the concept of perfect vectorial vortex beams (VVBs), which not merely have intensity profile independent of the polarization order and the topological charge of spiral phase, but also have stable intensity profile and state of polarization (SoP) upon propagation. Utilizing a Sagnac interferometer, we approximately generate perfect VVBs with
Peng, Li +6 more
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Sound generation by shock–vortex interactions
Journal of Fluid Mechanics, 1999Two-dimensional, unsteady, compressible flow fields produced by the interactions between a single vortex or a pair of vortices and a shock wave are simulated numerically. The Navier–Stokes equations are solved by a finite difference method. The sixth-order-accurate compact Padé scheme is used for spatial derivatives, together with the fourth ...
Inoue, Osamu, Hattori, Yuji
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2003
The aim in this chapter is to investigate the multidimensional Lamb equation, which interconnects a covector field u(x, t), a vector field v(x, t), and a function h(x, t): $$ frac{{\partial u}}{{\partial t}} + ({\text{rot }}u)v = - \frac{{\partial h}}{{\partial x}}. $$ (1.1)
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The aim in this chapter is to investigate the multidimensional Lamb equation, which interconnects a covector field u(x, t), a vector field v(x, t), and a function h(x, t): $$ frac{{\partial u}}{{\partial t}} + ({\text{rot }}u)v = - \frac{{\partial h}}{{\partial x}}. $$ (1.1)
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Effects of Vortex-Vortex Interaction in a Compressor Cascade With Vortex Generators
Volume 2A: Turbomachinery, 2015This paper presents a numerical investigation to explore the effects of vortex generators on a high speed compressor cascade. Secondary flow effects like the corner separation vortex have an influence on the performance of a compressor cascade such as leading to increased losses.
Tan Zheng, Xiaoqing Qiang, Jinfang Teng
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Devil’s vortex-lens arrays generating 3D optical vortex structures
SPIE Proceedings, 2013Optical vortices are employed in optical trapping applications for their ability to set microparticles into rotation. Devil’s Vortex Lenses have high diffraction efficiency and it is possible to take advantage of their particular volumetric focal structure to design versatile and efficient optical tweezers.
Alejandro Calabuig +6 more
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Multifunctional pneumatic vortex elements with a rotating vortex generator
Russian Engineering Research, 2011Multifunctional pneumatic vortex elements are considered. The basic parameters are established, and a calculation method is proposed.
N. A. Tishkova, B. A. Sentyakov
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Improving vortex tube performance based on vortex generator design
Energy, 2014Abstract The effect of vortex generator parameters (Cold orifice angle, Cold orifice diameter and Nozzle area) on vortex tube performance is investigated experimentally. Vortex tube is connected to a natural gas pipeline with constant pressure of 4 bars.
Mahmood Farzaneh-Gord, Meisam Sadi
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