Surface plasmon-polaritons in a two-layer graphene structure with a dielectric barrier layer under various control regimes

Dmitry A. Evseev, Svetlana V. Eliseeva, Anatolij M. Shutyi, Dmitry I. Sementsov

Ulyanovsk State University, Ulyanovsk, Russian Federation

Abstract: The dispersion dependences of a symmetric dielectric waveguide with graphene plates were compared in two regimes of graphene potential control from two sides of the structure. A general dispersion relation was obtained, the numerical analysis of which reveals the possibility of controlling the parameters of amplified surface modes. A numerical analysis of the dispersion relation solutions in the case of symmetry and asymmetry of the control potential on graphene layers has been carried out. A solution has been found that grows in amplitude with time in the region of negative conductivity of graphene in the presence of an inverse population of the levels.

Keywords: doped and inverted graphene, terahertz frequency range, symmetrical planar structure, chemical potential, real and imaginary parts of the propagation constant, amplification.

UDC: 535.39:535.34

Received: 02.09.2022
Received in revised form: 05.10.2022
Accepted: 20.11.2022

Language: English

DOI: 10.17516/1997-1397-2022-15-6-730-741