Results 21 to 30 of about 34,816 (291)
Nonuniform currents and spins of relativistic electron vortices in a magnetic field [PDF]
, 2017 We present a relativistic description of electron vortex beams in a homogeneous magnetic field. Including spin from the beginning reveals that spin-polarized electron vortex beams have a complicated azimuthal current structure, containing small rings of ...
Götte, Jörg B. +2 more
core +3 more sources
Broadband Vortex Beam Modulating System Based on Electrically Controlled Liquid Crystal Devices
Photonics, 2023 Vortex beams with helical phase wavefronts have recently emerged as a research hotspot because of their widespread applications such as ultra-high dimensional information encoding, quantum entanglement, and data transmission due to their unique ...
Xinyi Zhou +5 more
doaj +1 more source
Far-field measurements of vortex beams interacting with nanoholes [PDF]
, 2015 We measure the far-field intensity of vortex beams going through nanoholes. The process is analyzed in terms of helicity and total angular momentum. It is seen that the total angular momentum is preserved in the process, and helicity is not.
Fernandez-Corbaton, Ivan +3 more
core +4 more sources
Propagation of Vortex Electron Wave Functions in a Magnetic Field [PDF]
, 2012 The physics of coherent beams of photons carrying axial orbital angular momentum (OAM) is well understood and such beams, sometimes known as vortex beams, have found applications in optics and microscopy.
A. Zee +8 more
core +1 more source
Vortex strength and beam propagation factor of fractional vortex beams
Optics Express, 2019 9 pages, 5 ...
Jisen Wen +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 AdvancesOptical 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 +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 +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 +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 +2 more
openaire +2 more sources