Results 1 to 10 of about 1,705,853 (235)
Review on fractional vortex beam [PDF]
Nanophotonics, 2021 As an indispensable complement to an integer vortex beam, the fractional vortex beam has unique physical properties such as radially notched intensity distribution, complex phase structure consisting of alternating charge vortex chains, and more ...
Zhang Hao +5 more
doaj +6 more sources
Bidirectional Terahertz Vortex Beam Regulator. [PDF]
Materials (Basel), 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 J, Guo F, Zhang S, Liu C.
europepmc +3 more sources
Polygonal vortex beams in quasi-frequency-degenerate states [PDF]
IEEE Photonics Journal, 2018 We originally demonstrate the vortex beams with patterns of closed polygons [namely polygonal vortex beams (PVBs)] generated by a quasi-frequency-degenerate (QFD) Yb:CALGO laser resonator with astigmatic transformation. The PVBs with peculiar patterns of
Fu, Xing +4 more
core +4 more sources
Vortex beam generation with variable topological charge based on a spiral slit
Nanophotonics, 2019 We propose a vortex beam generator based on a nanometer spiral slit and explore the propagation rule of the topological charge. Compared to the common methods of generation of a vortex beam with a fixed topological charge, the optical vortex generated by
Wang Han +6 more
doaj +2 more sources
Acoustic Bessel Vortex Beam by Quasi-Three-Dimensional Reflected Metasurfaces [PDF]
Micromachines, 2021 Vortex beams have a typical characteristic of orbital angular momentum, which provides a new degree of freedom for information processing in remote communication and a form of non-contact manipulation for trapping particles.
Yin Wang +6 more
doaj +2 more sources
IEEE Access, 2020 In this paper, we propose a method to generate a high-order Bessel orbital angular momentum (OAM) vortex beam by using a single-layer reflective metasurface, which integrates the advantages of small size, high efficiency, insensitive polarization and ...
Haixia Liu +4 more
doaj +2 more sources
Ultrathin dual-mode vortex beam generator based on anisotropic coding metasurface. [PDF]
Sci Rep, 2021 In this paper, an anisotropic coding metasurface is proposed to achieve dual-mode vortex beam generator by independently manipulating the orthogonally linearly polarized waves. The metasurface is composed of ultrathin single-layer ground-backed Jerusalem
Zhang L, Guo J, Ding T.
europepmc +2 more sources
A Broadband Vortex Beam Generator Based on Single-Layer Hybrid Phase-Turning Metasurface [PDF]
Micromachines, 2023 Vortex beams carrying orbital angular momentum (OAM) have become a research frontier due to the prospect of improving spectral efficiency and transmission capacity in communication systems.
Cheng Fu, Jianing Zhao, Fang Li, Hao Li
doaj +2 more sources
Generation of E-band metasurface-based vortex beam with reduced divergence angle. [PDF]
Sci Rep, 2020 Vortex beams carrying orbital angular momentum (OAM) have attracted considerable attention for the development of high-capacity wireless communication systems due to their infinite sets of orthogonal modes. However, the practical applications of Laguerre-
Chung H +5 more
europepmc +2 more sources
Photonics, 2020 The analytical solution for the propagation of the laser beam with optical vortex through the system of lenses is presented. The optical vortex is introduced into the laser beam (described as Gaussian beam) by spiral phase plate.
Ireneusz Augustyniak +4 more
doaj +3 more sources