A Nonlinear Radio-Photon Conversion Device

• Published in: Photonics 2022-06, Vol.9 (6), p.417
• Main Authors: Vinogradova, Irina L., Gizatulin, Azat R., Meshkov, Ivan K., Bourdine, Anton V., Tiwari, Manish
• Format: Article
• Language: English
• Subjects: Communication channels; Converters; difference frequency generation; Efficiency; Frequency ranges; Mathematical models; Metal-organic frameworks; Nonlinear optics; Optical communication; Optical properties; orbital angular momentum; Parameters; quadratic-nonlinear structure; Radiation; radio photonics; Radio signals; radio-over-fiber; Refractivity; Terahertz frequencies; Wave equations; Wave propagation
• ISSN: 2304-6732; 2304-6732
• DOI: 10.3390/photonics9060417

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.