Results 291 to 300 of about 1,705,952 (334)

Anomalous reflection and vortex beam generation by multi-bit coding acoustic metasurfaces

Applied Physics Letters, 2019
Coding metasurfaces can combine simple logical bits to acquire sophisticated functions in wave control. Recently, coding metasurfaces have been demonstrated to take flexible control of the acoustic wave and realize intriguing functionalities such as wave
Ya Zhang, Boyang Xie, Wenwei Liu, Hua Cheng, Shuqi Chen, Jianguo Tian   +5 more
semanticscholar   +1 more source

Switchable Second‐Harmonic Generation of Airy Beam and Airy Vortex Beam

Advanced Optical Materials, 2020
Airy beam and Airy vortex beam with intriguing characteristics have been extensively studied in linear optics, while their dynamic nonlinear conversion has rarely been explored and remains challenging.
Yuan Liu, Wei Chen, Jie Tang, Xiaoyi Xu, Peng Chen, Chao Ma, Wang Zhang, Bingyan Wei, Yang Ming, Yang Ming, G. Cui, Yong Zhang, Wei Hu, Yan-qing Lu   +13 more
semanticscholar   +1 more source

Polarization characteristics of radially polarized partially coherent vortex beam in anisotropic plasma turbulence

Waves in Random and Complex Media, 2020
This paper introduces the propagation properties and polarization characteristics of radially polarized partially coherent vortex beams in anisotropic plasma turbulence and discusses in detail the distribution of light intensity in such beams as a ...
Jiang-ting Li, Jiachao Li, Lixin Guo, Mingjian Cheng, Luo Xi   +4 more
semanticscholar   +1 more source

Vortex Coherent Beam Combining

Laser Congress 2021 (ASSL,LAC), 2021
We propose Coherent Beam Combining with vortex wavefront to create an effective optical trap. More than 50 dB barrier height (wall to center irradiance ratio) for 127-hexagonal lattice was shown in numerical model.
Jan K. Jabczynski, Przemyslaw Gontar, Lukasz Gorajek, Waldemar Zendzian, Krzysztof Kopczyński   +4 more
openaire   +1 more source

Vortex Hermite–Gaussian laser beams

Optics Letters, 2015
We study elliptical vortex Hermite-Gaussian (vHG) beams, which are described by the complex amplitude proportional to the nth-order Hermite polynomial whose argument is a function of a real parameter a. At |a|1, similar isolated optical nulls of the vHG beams are found on the horizontal axis. At a=0, the vHG beam becomes identical to the HG mode of the
V V, Kotlyar, A A, Kovalev, A P, Porfirev   +2 more
openaire   +2 more sources

Spatial intensity correlations of a vortex beam and a perfect optical vortex beam

Journal of the Optical Society of America A, 2019
We present a model based on the Fresnel diffraction scheme for the spatial coherence function of random fields created by scattering optical vortex and perfect vortex beams. By using the spatial coherence function we showed analytically, numerically, and experimentally the dependence and independence of the speckle size of an optical vortex and perfect
Cristian Hernando, Acevedo, Yezid, Torres-Moreno, Aristide, Dogariu   +2 more
openaire   +2 more sources

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.
openaire   +2 more sources

Unwound vortex beam shaping

SPIE Proceedings, 2007
A beam shaping nietliod based on the superposition and unwinding of vortex beams is proposed. This method allows for the continuous tuning of the orbital angular momentum content and longitudinal intensity distribution of the beam. We provide with a closed expression for the orbital angular momentum content of a general superposition of vortex beams ...
Carlos López-Mariscal, Julio C. Gutiérrez-Vega   +1 more
openaire   +1 more source

Vortex beam generated by circular-polarized metasurface reflector antenna

Journal of Physics D: Applied Physics, 2019
Vortex beams with orbital angular momentum (OAM) can remarkably increase the channel capacity without signal process, thus attract more and more attention of researchers, and various novel methods of generating vortex beams blow out.
He Wang, Yongfeng Li, Yajuan Han, Ya Fan, S. Sui, Hongya Chen, Jiafu Wang, Q. Cheng, T. Cui, S. Qu   +9 more
semanticscholar   +1 more source

The topological charge measurement of the vortex beam based on dislocation self-reference interferometry

Physica Scripta, 2019
Vortex beam generally refers to a kind of beam with orbital angular momentum, which has been widely implemented in the field of optical trapping, optical communication, rotation detection, etc.
Bin Lan, Chao Liu, Daoman Rui, Mo Chen, Feng Shen, H. Xian   +5 more
semanticscholar   +1 more source