Electrically controllable active plasmonic directional coupler of terahertz signal based on a periodical dual grating gate graphene structure.

ABSTRACT: We propose a concept of an electrically controllable plasmonic directional coupler of terahertz signal based on a periodical structure with an active (with inversion of the population of free charge carriers) graphene with a dual grating gate and numerically calculate its characteristics. Proposed concept of plasmon excitation by using the grating gate offers highly effective coupling of incident electromagnetic wave to plasmons as compared with the excitation of plasmons by a single diffraction element. The coefficient which characterizes the efficiency of transformation of the electromagnetic wave into the propagating plasmon has been calculated. This transformation coefficient substantially exceeds the unity (exceeding 6 in value) due to amplification of plasmons in the studied structur

SUBMITTER: Morozov MY 

PROVIDER: S-EPMC8169778 | biostudies-literature | 2021 Jun

REPOSITORIES: biostudies-literature