Results 31 to 40 of about 3,654 (163)

Vortex strength and beam propagation factor of fractional vortex beams

Optics Express, 2019
9 pages, 5 ...
Jisen Wen, Li-Gang Wang, Xihua Yang, Junxiang Zhang, Shi-Yao Zhu   +4 more
openaire   +3 more sources

Review on vortex beams with low spatial coherence

Advances in Physics: X, 2019
Vortex beams with helical phase, carrying phase singularity and orbital angular momentum, have attract great attention in the past decades due to their wide applications in optical communications, optical manipulation, super-resolution imaging and so on.
Xianlong Liu, Jun Zeng, Yangjian Cai
doaj   +1 more source

Multimode vector beam synthesis and rapid modulation via interferometric methods [PDF]

AIP Advances
Optical interference techniques are widely regarded as an effective approach for generating vector beams. In this paper, we theoretically simulate the generation of multimode vector beams through the vortex beams interference. Then, in the experiment, we
Qiyou Huang, Zhenye Ge, Duigao Yi, Kaibin Xu, Renfei Zheng, Zhifei Yu, Ting Zhang, Bing Chen   +7 more
doaj   +1 more source

Optics-to-THz conversion of vortex beams using nonlinear difference frequency generation [PDF]

Компьютерная оптика, 2019
In this paper, using a modified model of slowly varying amplitudes, a process of optics-to-THZ-conversion of vortex beams based on the nonlinear difference frequency generation in a medium with second-order susceptibility is considered.
Valeriy Bagmanov, Albert Sultanov, Azat Gizatulin, Ivan Meshkov, Ilya Kuk, Elizaveta Grakhova, Guzel Abdrakhmanova, Irina Vinogradova   +7 more
doaj   +1 more source

Microwave vortex beam launcher design [PDF]

IET Microwaves, Antennas & Propagation, 2018
A novel design for a vectorial vortex beam launcher in the microwave regime is devised. The beam is formed by launching a single guided transverse electric (TE) mode of a metallic circular waveguide into free‐space. Excitation is achieved by the mean of an inserted coaxial loop antenna.
Nedime Pelin M.H. Salem, Edip Niver, Mohamed A. Salem   +2 more
openaire   +2 more sources

Abruptly autofocusing vortex beams

Optics Express, 2012
We generate abruptly autofocusing beams that produce vortices at the focus. We give explicit equations for the phase-only Fourier masks that generate these beams including explanations for controlling the focal distance and numerical aperture. We show experimental results for the focal distance, the vortex pattern and show that the diameter of the ...
Jeffrey A, Davis, Don M, Cottrell, David, Sand   +2 more
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Nondiffracting beams for vortex tomography [PDF]

Optics Letters, 2010
3 pages. 2 eps figures.
Rehacek, J., Hradil, Z., Bouchal, Z., Klimov, A. B., Rigas, I., Sanchez-Soto, L. L.   +5 more
openaire   +3 more sources

Bidirectional Terahertz Vortex Beam Regulator

Materials, 2022
Most of the reported vortex beam generators with orbital angular momentum (OAM) in the terahertz region only operate in either the reflection mode or the transmission mode, which greatly limits the integration and application in terahertz technology systems. Herein, we propose a full-space vortex beam regulator at two different frequencies. By changing
Li, Jiusheng, Guo, Fenglei, Zhang, Shuping, Liu, Chao   +3 more
openaire   +2 more sources

Divergence of optical vortex beams [PDF]

Applied Optics, 2015
4 pages, 4 ...
Reddy, Salla Gangi, P, Chithrabhanu, Prabhakar, Shashi, Anwar, Ali, Banerji, J., Singh, R. P.   +5 more
openaire   +3 more sources

Propagation and Transformation of Vortexes in Linear and Nonlinear Radio-Photon Systems

Fibers, 2022
The article is devoted to issues related to the propagation and transformation of vortexes in the optical range of frequency. Within the framework of the traditional and modified model of slowly varying envelope approximation (SVEA), the process of ...
Valery H. Bagmanov, Albert Kh. Sultanov, Ivan K. Meshkov, Azat R. Gizatulin, Raoul R. Nigmatullin, Airat Zh. Sakhabutdinov   +5 more
doaj   +1 more source