scholarly journals Direct observation of the topological charge of a terahertz vortex beam generated by a Tsurupica spiral phase plate

2014 ◽  
Vol 104 (26) ◽  
pp. 261104 ◽  
Author(s):  
K. Miyamoto ◽  
K. Suizu ◽  
T. Akiba ◽  
T. Omatsu
Keyword(s):  
Direct Observation ◽  
Topological Charge ◽  
Phase Plate ◽  
Vortex Beam ◽  
Spiral Phase Plate ◽  
Spiral Phase

scholarly journals Spiral phase plate with multiple singularity centers

2020 ◽  
Vol 44 (6) ◽  
pp. 901-908
Author(s):  
V.V. Kotlyar ◽  
A.A. Kovalev ◽  
E.S. Kozlova ◽  
A.P. Porfirev
Keyword(s):  
Topological Charge ◽  
Beam Power ◽  
Phase Plate ◽  
Circular Aperture ◽  
Vortex Beam ◽  
Finite Radius ◽  
Phase Singularity ◽  
Initial Plane ◽  
Topological Charges ◽  
Spiral Phase

We investigate a multispiral phase plate (MSPP) with multiple centers of phase singularity arbitrarily located in the MSPP plane. Equations to describe the topological charge of an optical vortex in the initial plane immediately behind the MSPP and orbital angular momentum (OAM) normalized relative to the beam power are derived. The topological charge in the initial plane is found as a sum of the topological charges of all singularities if their centers are located inside a finite-radius circular aperture. If the phase singularity centers are partially located on the boundary of a circular diaphragm limiting the MSPP, the total topological charge is found as the sum of all singularities divided by 2. Total OAM that the vortex carries depends on the location of the singularity centers: the farther from the center of the plate the singularity center is located, the smaller is its contribution to the OAM. If all singularity centers are located on the boundary of the diaphragm limiting MSPP, then the OAM of the vortex beam equals zero, although in this case the topological charge of the beam is nonzero.

Generation and Interference of Vortex Beam Based on Spiral Phase Plate

2016 ◽  
Vol 53 (9) ◽  
pp. 092602
Author(s):  
郭苗军 Guo Miaojun ◽  
曾军 Zeng Jun ◽  
李晋红 Li Jinhong
Keyword(s):  
Phase Plate ◽  
Vortex Beam ◽  
Spiral Phase Plate ◽  
Spiral Phase

scholarly journals Production of Vortex Beam Modes from a Magnetic Spiral Phase Plate

2013 ◽  
Vol 19 (S2) ◽  
pp. 1168-1169
Author(s):  
A.M. Blackburn ◽  
J.C. Loudon
Keyword(s):  
Phase Plate ◽  
Vortex Beam ◽  
Spiral Phase Plate ◽  
Magnetic Spiral ◽  
Spiral Phase

Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

A modified multiplexed vortex helico-conical petal-like zone plate

2021 ◽  
Author(s):  
Tian Xia ◽  
Shubo Cheng ◽  
Wenke Xie ◽  
Shaohua Tao
Keyword(s):  
Topological Charge ◽  
Zone Plate ◽  
Absolute Difference ◽  
Phase Plate ◽  
Rotation Direction ◽  
Clockwise Direction ◽  
Spiral Phase Plate ◽  
The Absolute ◽  
L1 And L2 ◽  
Spiral Phase

Abstract A modified multiplexed vortex helico-conical petal-like zone plate (MMVHPZP) is proposed to generate a polygon-like beam or light-arm beam with an adjustable opening. The MMVHPZP consists of the modified helico-conical petal-like zone plate (MHPZP) with the topological charge l and exponent n, and the multiplexed vortex spiral phase plate (MVSPP) with the inner topological charge l1 and outer topological charge l2. Moreover, when l1 is equal or unequal to l2, the MMVHPZP has the adjustable polygon-like beam or light-arm beam, respectively. In addition, when n is small or large, the number of arms is equal to the absolute difference between l1 and l2 or the sum of one and the absolute difference between l1 and l2, respectively. Furthermore, for the different l1 or l2, the opening is constant. With the increase of the n or l, the opening is larger. When l1 is greater or less than l2, the rotation direction of arms is the anticlockwise or clockwise direction, respectively.

A Spiral Phase Plate for an Optical Vortices Generation

2018 ◽  
pp. 1-43 ◽  
Author(s):  
V. V. Kotlyar ◽  
A. A. Kovalev ◽  
A. P. Porfirev
Keyword(s):  
Optical Vortices ◽  
Phase Plate ◽  
Spiral Phase Plate ◽  
Spiral Phase
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