Horn antennas for generating radio waves bearing orbital angular momentum by using spiral phase plate

2016 ◽  
Vol 10 (13) ◽  
pp. 1420-1427 ◽  
Author(s):  
Wenlong Wei ◽  
Kourosh Mahdjoubi ◽  
Christian Brousseau ◽  
Olivier Emile
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Phase Plate ◽  
Radio Waves ◽  
Horn Antennas ◽  
Spiral Phase Plate ◽  
Spiral Phase

Propagation and orbital angular momentum of vortex beams generated from a spiral phase plate-fiber

2019 ◽  
Vol 16 (3) ◽  
pp. 035106
Author(s):  
Manman Ding ◽  
Ying Chen ◽  
Yongguang Zhao ◽  
Wei Zhou ◽  
Alexander Koshelev ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Phase Plate ◽  
Vortex Beams ◽  
Spiral Phase Plate ◽  
Spiral Phase

Orbital angular momentum of a laser beam behind an off-axis spiral phase plate

2019 ◽  
Vol 44 (15) ◽  
pp. 3673 ◽  
Author(s):  
Victor Kotlyar ◽  
Alexey Kovalev ◽  
Alexey Porfirev ◽  
Elena Kozlova
Keyword(s):  
Angular Momentum ◽  
Laser Beam ◽  
Orbital Angular Momentum ◽  
Phase Plate ◽  
Spiral Phase Plate ◽  
Spiral Phase

scholarly journals Orbital angular momentum of an arbitrary axisymmetric light field after passing through an off-axis spiral phase plate

2018 ◽  
Vol 42 (2) ◽  
pp. 212-218
Author(s):  
V. V. Kotlyar ◽  
A. A. Kovalev
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Intensity Distribution ◽  
Incident Beam ◽  
Phase Plate ◽  
Total Orbital Angular Momentum ◽  
Rotationally Symmetric ◽  
Symmetric Complex ◽  
Spiral Phase Plate ◽  
Spiral Phase

We obtain a simple formula for the relative total orbital angular momentum (OAM) of a paraxial light beam with arbitrary rotationally symmetric complex amplitude passed through a spiral phase plate (SPP) whose center is shifted from the optical axis. The formula shows that the OAM equals zero if the incident beam is bounded by an aperture and the SPP center is outside this aperture. For the incident beam bounded by an annular aperture, there is another interesting consequence of the obtained expression. The total OAM of such a beam is the same regardless of the position of the SPP center within the shaded circle of the aperture. Thus, it would be appropriate to illuminate the SPP by beams with an annular intensity distribution, since in this case an inaccurate alignment of the SPP center and the center of the annular intensity distribution does not affect the total OAM of the beam. We also obtain an expression for the OAM density of such a beam in the initial plane.

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