scholarly journals Phase retrieval for short wavelength orbital angular momentum beams using knife-edge diffraction

2020 ◽  
Vol 474 ◽  
pp. 126077
Author(s):  
Peifan Liu ◽  
Jun Yan ◽  
Hao Hao ◽  
Ying K. Wu
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Short Wavelength ◽  
Phase Retrieval ◽  
Knife Edge ◽  
Edge Diffraction

scholarly journals Data decoding of integer orbital angular momentum beams based in straight edge diffraction nanometric film

DYNA ◽  
2019 ◽  
Vol 86 (209) ◽  
pp. 170-179
Author(s):  
Jesus Hernan Mendoza Castro ◽  
Carlos Fernando Diaz Meza ◽  
Cristian Hernando Acevedo ◽  
Yezid Torres Moreno ◽  
Jaime Guillermo Barrero
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Optical Communications ◽  
Electromagnetic Interference ◽  
Transmission Channel ◽  
Implementation Cost ◽  
Edge Diffraction ◽  
Main Disadvantage ◽  
Momentum Mode ◽  
Nanometric Film

The orbital angular momentum revolutionized optical communications, like an OAM beam of light need not be interrupted for the transfer ofdata, provides immunity to electromagnetic interference, allows increase bandwidth, rate and transmission capacity information, making theprocess more efficient. Supported by the ability to encode information on OAM modes of light, is necessary the development of a decoder thatintegrate to hardware systems, solve the problem of current techniques, which main disadvantage is to require the use of additional energysources, increasing the implementation cost, and make it less compact. The purpose of this report is towards modelling an optoelectronicdecoder system which discriminates the orbital angular momentum mode in the beam, associated with transmitted information and translates itfrom the selected transmission channel (i.e. outdoor atmosphere) to a recognizable information. Current methodology proposed for thispurpose, integrates the use of thin films of nanometric order, whose design features allows interaction with OAM beams that, can bedistinguish its topological charge.

Spiral spectrum of multi-modified Bessel–Gaussian Schell beams in non-Kolmogorov turbulence

2016 ◽  
Vol 30 (26) ◽  
pp. 1650193 ◽  
Author(s):  
Yun Zhu ◽  
Yixin Zhang ◽  
Ye Li ◽  
Zhengda Hu
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Short Wavelength ◽  
Beam Waist ◽  
Long Wavelength ◽  
Azimuthal Index ◽  
Received Power ◽  
Rytov Approximation ◽  
Kolmogorov Turbulence ◽  
Optimal Value

On the basis of the Rytov approximation, we investigate the effects of non-Kolmogorov turbulence on the spread of the spiral spectrum and the received power of multi-modified Bessel–Gaussian Schell (MMBGS) beams carrying orbital angular momentum. Numerical results show that the spread of the spiral spectrum increases as the azimuthal index of the source increases and that an optimal value of the beam waist is obtained. We find that the spread of partially coherent MMBGS beams with short wavelength is more robust than that of beams with long wavelength. The complete reverse is true for fully coherent MMBGS beams.

Advanced Mode Unity Using Loop Antennas Proximate to Reflector for Orbital Angular Momentum Communication

2018 ◽  
Author(s):  
Ryohei Yamagishi ◽  
Hiroto Otsuka ◽  
Ryo Ishikawa ◽  
Akira Saitou ◽  
Hiroshi Suzuki ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Loop Antennas
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