A. V. Radivon, M. I. Paukov, G. M. Katyba, N. I. Raginov, A. V. Chernykh, A. S. Ezerskii, E. G. Tsiplakova, I. I. Rakov, A. V. Arsenin, I. E. Spektor, K. I. Zaitsev, D. V. Krasnikov, N. V. Petrov, V. Volkov, A. G. Nasibulin, M. G. Burdanova, “Spatial modulation of terahertz radiation using optical vortex generators based on thin films of single-wall carbon nanotubes”, Optics and Spectroscopy, 2025, Volume 133, Issue 3,Pages <nobr>303

Proceedings of The XXVIII Annual International Conference "Saratov Fall Meeting 2024", September 23-27, 2024, Saratov, Russia. Advanced materials in optoelectronics, laser physics, and photonics
Ultraviolet, infrared, and terahertz optics

Spatial modulation of terahertz radiation using optical vortex generators based on thin films of single-wall carbon nanotubes

A. V. Radivon^a, M. I. Paukov^a, G. M. Katyba^b, N. I. Raginov^c, A. V. Chernykh^d, A. S. Ezerskii^d, E. G. Tsiplakova^d, I. I. Rakov^a, A. V. Arsenin^a, I. E. Spektor^e, K. I. Zaitsev^e, D. V. Krasnikov^c, N. V. Petrov^df, V. Volkov^a, A. G. Nasibulin^c, M. G. Burdanova^ab

^a Centre for Photonics and Two-Dimensional Materials, Moscow Institute of Physics and Technology
^b Osipyan Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region
^c Skolkovo Institute of Science and Technology
^d St. Petersburg National Research University of Information Technologies, Mechanics and Optics
^e Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow
^f Harbin Engineering University

Abstract: This paper presents the results of a study of the operation of an orbital angular momentum modulator in the submillimeter range (340 GHz) based on thin films of single-walled carbon nanotubes. To obtain the characteristics of spatial modulation of a Gaussian beam, spiral zone plates were created using a modern technique for synthesis and deposition of nanostructures of various thicknesses on a substrate. The use of a combination of spiral zone plates allows redistributing energy in a terahertz beam over various generated optical vortices. The manufactured diffraction elements have tunable characteristics, such as redistributed orbital angular momentum and the number of charges. The resulting orbital angular momentum generators can be integrated into next-generation communication systems.

Keywords: carbon nanotubes, spatial modulation of terahertz radiation, tunable optical element, spiral zone plate, optical vortex.

Received: 05.02.2025
Revised: 20.02.2025
Accepted: 28.02.2025

DOI: 10.61011/OS.2025.03.60248.15-25