The Principle of Constructing Antenna Arrays for Generating OAM Radio Waves Based on Multipole Decomposition of Electromagnetic Field

Meshkov, Ivan K.; Gizatulin, Azat R.; Kuk, I. A.; Grakhova, Elizaveta P.; Abdrakhmanova, Guzel I.; Voronkova, Anna V.; Vinogradova, Irina L.; Bagmanov, Valeriy Kh.; Sultanov, Albert Kh.

doi:10.1109/telfor.2018.8611889

“…It is mentioned in [26,27] that quadratically nonlinear PCFs can be successfully used to generate the second harmonic and difference frequency [28], including the THz range [29]. But if a high nonlinearity is achieved by spreading the input light beam over highintensity narrow light "filaments", then this will actually lead to multipole [30] generation of the radio frequency wave and, quite possibly, to distortion of the information signal carried by it. Therefore, PCFs can potentially be used for the problem of square-nonlinear generation of the RF difference frequency, but the considerations presented above will require optimization of the PCF structure to reduce the distortion of the generated signal, as shown in the above-mentioned papers.…”

Section: Analysis Of Optical Quadratic-nonlinear Materials and Structures Potentially Suitable For The Design Of A Nonlinear Convertermentioning

confidence: 99%

A Nonlinear Radio-photon Conversion Device

Vinogradova¹,

Gizatulin²,

Meshkov³

et al. 2022

Preprint

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The article analyzes existing materials and structures with quadratic-nonlinear optical properties that can be used to generate a difference frequency in the terahertz and sub-terahertz frequency ranges. The principle of constructing a nonlinear optical-radio converter, based on an optical focon (a focusing cone), is proposed. Based on the assumption that this focon can be implemented from the metal-organic framework (MOF), we propose a technique for modeling its parameters. The mathematical model of the process of propagation and nonlinear interaction of waves inside the focon is based on a simplification of the nonlinear wave equation. Within the framework of the developed model, the following parameters are approximately determined: the 3D gradient of the linear refractive index and the function determining the geometric profile of the focon, which provide a few-mode-based generation of the difference frequency.

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“…It is mentioned in [30,31] that quadratically nonlinear PCFs can be successfully used to generate the second harmonic and difference frequency [32], including the THz range [33]. However, if a high nonlinearity is achieved by spreading the input light beam over highintensity narrow light "filaments", then this will actually lead to multipole [34] generation of the radio frequency wave and, quite possibly, will distort the information being carried. Therefore, PCFs can potentially be used for the problem of square-nonlinear generation of the RF difference frequency, but the considerations presented above will require optimization of the PCF structure to reduce the distortion of the generated signal, as shown in the above-mentioned papers.…”

Section: Analysis Of Optical Quadratic-nonlinear Materials and Struct...mentioning

confidence: 99%

A Nonlinear Radio-Photon Conversion Device

Vinogradova

¹

,

Gizatulin

²

,

Meshkov

³

et al. 2022

Photonics

Self Cite

0

View full text Add to dashboard Cite

The article analyzes existing materials and structures with quadratic-nonlinear optical properties that can be used to generate a difference frequency in the terahertz and sub-terahertz frequency ranges. The principle of constructing a nonlinear optical-radio converter, based on an optical focon (a focusing cone), is proposed. Based on the assumption that this focon can be implemented from the metal-organic framework (MOF), we propose a technique for modeling its parameters. The mathematical model of the process of propagation and nonlinear interaction of waves inside the focon is based on a simplification of the nonlinear wave equation. Within the framework of the developed model, the following parameters are approximately determined: the 3D gradient of the linear refractive index and the function determining the geometric profile of the focon, which provide a few-mode-based generation of the difference frequency. The achieved theoretical efficiency of radio frequency generation is at least 1%; the proposed device provides a guiding structure for both optical and radio signals in contrast to the known solutions.

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