A numerical analysis of the phase-matching conditions during the incidence of one or two counterpropagating laser beams on an ordered array of single-walled carbon nanotubes (CNTs) is performed. The conditions for the generation of slow surface plasmon waves of the terahertz (THz) and far infrared range propagating along the nanotubes of the irradiated array are determined. It is shown that the plasmon frequency can be controlled by changing the angle of incidence of laser radiation on the structure under study. Thus, it is possible to fulfill the condition of longitudinal resonance, in which each array nanotube is a dipole antenna radiating at the plasmon frequency. In this case, the array forms a system of a large number of in-phase emitters, which allows increasing the efficiency of conversion of laser radiation into THz radiation in comparison with a single nanoantenna.
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This work was supported by the Russian Foundation for Basic Research (project no. 18-29-19101) and by the Ministry of Science and Higher Education (project no. 0004-2019-0002).
Abbreviations: CNT—carbon nanotube; PP—plasmon polaritons; THz—terahertz.
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Afanas’ev, S.A., Zolotovsky, I.O., Kadochkin, A.S. et al. Arrays of Carbon Nanotubes in a Field of Continuous Laser Radiation. Russ Microelectron 49, 16–24 (2020). https://doi.org/10.1134/S1063739720010023