Angular momentum density of a linearly polarized Lorentz–Gauss vortex beam

2014 ◽  
Vol 313 ◽  
pp. 157-169 ◽  
Author(s):  
Guoquan Zhou ◽  
Guoyun Ru
Keyword(s):  
Angular Momentum ◽  
Momentum Density ◽  
Vortex Beam ◽  
Linearly Polarized

scholarly journals Generating Different Polarized Multiple Vortex Beams at Different Frequencies from Laminated Meta-Surface Lenses

Micromachines ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 61
Author(s):  
Pengfei Gao ◽  
Rui Yang
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Communication System ◽  
The Other ◽  
Vortex Beam ◽  
Other Hand ◽  
High Efficient ◽  
Linearly Polarized ◽  
Vortex Beams ◽  
The Way

We demonstrate the generation of multiple orbital angular momentum (OAM) vortex beams with different radiating states at different frequencies through a laminated meta-surface lens consisting of a dual polarized meta-array interconnected with a frequency selective meta-array. The co-linearly polarized (LP) waves from the source can directly penetrate the meta-surface lens to form multiple OAM vortex beams at one frequency. On the other hand, the meta-surface lens will be capable of releasing the cross-LP counterparts at another frequency with high-efficient polarization conversions to have multiple OAM vortex radiations with different radiating directions and vortex modes. Our design, using laminated meta-surface lens to synthesize multiple OAM vortex beams with orthogonal polarizations at different frequencies, should pave the way for building up more advanced vortex beam communication system with expanded diversity of the meta-device.

Angular momentum density of a Gaussian vortex beam

2014 ◽  
Vol 57 (4) ◽  
pp. 619-627 ◽  
Author(s):  
GuoQuan Zhou ◽  
XiaoGang Wang ◽  
ChaoQing Dai ◽  
XiuXiang Chu
Keyword(s):  
Angular Momentum ◽  
Momentum Density ◽  
Vortex Beam

scholarly journals Arbitrary polarization conversion for pure vortex generation with a single metasurface

Nanophotonics ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 727-732
Author(s):  
Marco Piccardo ◽  
Antonio Ambrosio
Keyword(s):  
Angular Momentum ◽  
Polarization Conversion ◽  
Vortex Beam ◽  
Vortex Generation ◽  
Optical Elements ◽  
Amplitude Control ◽  
Cavity Resonators ◽  
Vortex Beams ◽  
Topological Charges ◽  
Selection Of

AbstractThe purity of an optical vortex beam depends on the spread of its energy among different azimuthal and radial modes, also known as $\ell $- and p-modes. The smaller the spread, the higher the vortex purity and more efficient its creation and detection. There are several methods to generate vortex beams with well-defined orbital angular momentum, but only few exist allowing selection of a pure radial mode. These typically consist of many optical elements with rather complex arrangements, including active cavity resonators. Here, we show that it is possible to generate pure vortex beams using a single metasurface plate—called p-plate as it controls radial modes—in combination with a polarizer. We generalize an existing theory of independent phase and amplitude control with birefringent nanopillars considering arbitrary input polarization states. The high purity, sizeable creation efficiency, and impassable compactness make the presented approach a powerful complex amplitude modulation tool for pure vortex generation, even in the case of large topological charges.

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