Nonlinear spiral phase plates for generation of light fields with orbital angular momentum

2020 ◽  
Author(s):  
Alexey P. Porfirev ◽  
Velentin Logachev ◽  
Georgy Gridin ◽  
Mikhail Kirilenko ◽  
Sergey Fomchenkov
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Light Fields ◽  
Phase Plates ◽  
Spiral Phase

scholarly journals Experimental evaluation of 3D printed spiral phase plates for enabling an orbital angular momentum multiplexed radio system

2019 ◽  
Vol 6 (12) ◽  
pp. 191419 ◽  
Author(s):  
B. Allen ◽  
T. Pelham ◽  
Y. Wu ◽  
T. Drysdale ◽  
D. Isakov ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Communication Link ◽  
Material Interface ◽  
Radio System ◽  
Dielectric Lens ◽  
3D Printed ◽  
Phase Plates ◽  
Spiral Phase ◽  
Additional Loss

This paper evaluates the performance of three-dimensionally (3D) printed spiral phase plates (SPPs) for enabling an orbital angular momentum (OAM) multiplexed radio system. The design and realization of the SPPs by means of additive manufacturing exploiting a high-permittivity material is described. Modes 1 and 2 SPPs are then evaluated at 15 GHz in terms of 3D complex radiation pattern, mode purity and beam collimation by means of a 3D printed dielectric lens. The results with the lens yield a crosstalk of −8 dB for between modes 1 and −1, and −11.4 dB for between modes 2 and −2. We suggest a mode multiplexer architecture that is expected to further reduce the crosstalk for each mode. An additional loss of 4.2 dB is incurred with the SPPs inserted into the communication link, which is undesirable for obtaining reliable LTE-based communications. Thus, we suggest: using lower loss materials, seeking ways to reduce material interface reflections or alternative ways of OAM multiplexing to realize a viable OAM multiplexed radio system.

scholarly journals Spectral control of the orbital angular momentum of a laser beam based on 3D properties of spiral phase plates fabricated for an infrared wavelength

2020 ◽  
Vol 28 (12) ◽  
pp. 18407 ◽  
Author(s):  
Svetlana N. Khonina ◽  
Vladimir V. Podlipnov ◽  
Sergey V. Karpeev ◽  
Andrey V. Ustinov ◽  
Sergey G. Volotovsky ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Laser Beam ◽  
Orbital Angular Momentum ◽  
Infrared Wavelength ◽  
Spectral Control ◽  
Phase Plates ◽  
Spiral Phase

scholarly journals Formation of Inverse Energy Flux in the Case of Diffraction of Linearly Polarized Radiation by Conventional and Generalized Spiral Phase Plates

Photonics ◽  
2021 ◽  
Vol 8 (7) ◽  
pp. 283
Author(s):  
Andrey Ustinov ◽  
Svetlana Khonina ◽  
Alexey Porfirev
Keyword(s):  
Energy Flux ◽  
Poynting Vector ◽  
Numerical Study ◽  
Longitudinal Component ◽  
Light Fields ◽  
Linearly Polarized ◽  
Linearly Polarized Radiation ◽  
Phase Plates ◽  
Spiral Phase ◽  
Polarized Radiation

Recently, there has been increased interest in the shaping of light fields with an inverse energy flux to guide optically trapped nano- and microparticles towards a radiation source. To generate inverse energy flux, non-uniformly polarized laser beams, especially higher-order cylindrical vector beams, are widely used. Here, we demonstrate the use of conventional and so-called generalized spiral phase plates for the formation of light fields with an inverse energy flux when they are illuminated with linearly polarized radiation. We present an analytical and numerical study of the longitudinal and transverse components of the Poynting vector. The conditions for maximizing the negative value of the real part of the longitudinal component of the Poynting vector are obtained.

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