Plasmonics

Dispersion of surface plasmon-polaritons in metal single-walled carbon nanotubes and ordered arrays on their basis

S. A. Afanas'ev^a, V. A. Zaitsev^a, S. G. Moiseev^ab, I. A. Rozhleis^a, D. G. Sannikov<sup>a

a</sup> Ulyanovsk State University
^b Ul'yanovsk Branch of Institute of Radioengineering and Electronics, Russian Academy of Sciences

Abstract: This study proposes a hydrodynamic model to investigate the propagation of eigenwaves (surface plasmon-polaritons) in metallic single-walled carbon nanotubes and ordered arrays based on them. A numerical analysis of the dispersion properties of surface plasmon-polaritons in the terahertz range is performed, taking into account losses and the tensor nature of the surface conductivity of single-walled carbon nanotubes. The conditions under which the interaction between neighboring nanotubes in the array does not affect the dispersion characteristics of surface plasmon-polaritons are identified. It is demonstrated that the highest values of the deceleration coefficient (the ratio of the speed of light to the phase velocity of surface plasmon-polaritons) for the fundamental mode, exceeding 100, are achieved in ordered arrays of single-walled carbon nanotubes with radii greater than 2 nm at frequencies around 40 THz and above. The obtained results can be applied in the development of compact amplifiers and generators of terahertz radiation based on arrays of single-walled carbon nanotubes.

Keywords: surface plasmon polariton (SPP), single-walled carbon nanotube (SWCNT).

Received: 19.02.2025
Revised: 19.02.2025
Accepted: 30.06.2025

DOI: 10.61011/OS.2025.07.61112.7624-25

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