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. P...

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Autores principales:	Mikhail Yu. Morozov, Vyacheslav V. Popov, Denis V. Fateev
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/6cc2e024736d4b0db56e10d0cfa29017
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spelling	oai:doaj.org-article:6cc2e024736d4b0db56e10d0cfa290172021-12-02T15:02:57ZElectrically controllable active plasmonic directional coupler of terahertz signal based on a periodical dual grating gate graphene structure10.1038/s41598-021-90876-22045-2322https://doaj.org/article/6cc2e024736d4b0db56e10d0cfa290172021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-90876-2https://doaj.org/toc/2045-2322Abstract 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 structure by using pumped active graphene. We have shown that applying different dc voltages to different subgratings of the dual grating gate allows for exciting the surface plasmon in graphene, which can propagate along or opposite the direction of the structure periodicity, or can be a standing plasma wave for the same frequency of the incident terahertz wave. The coefficient of unidirectionality, which is the ratio of the plasmon power flux propagating along (opposite) the direction of the structure periodicity to the sum of the absolute values of plasmon power fluxes propagating in both directions, could reach up to 80 percent. Two different methods of the plasmon propagation direction switching are studied and possible application of the found effects are suggested.Mikhail Yu. MorozovVyacheslav V. PopovDenis V. FateevNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Mikhail Yu. Morozov Vyacheslav V. Popov Denis V. Fateev Electrically controllable active plasmonic directional coupler of terahertz signal based on a periodical dual grating gate graphene structure
description	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 structure by using pumped active graphene. We have shown that applying different dc voltages to different subgratings of the dual grating gate allows for exciting the surface plasmon in graphene, which can propagate along or opposite the direction of the structure periodicity, or can be a standing plasma wave for the same frequency of the incident terahertz wave. The coefficient of unidirectionality, which is the ratio of the plasmon power flux propagating along (opposite) the direction of the structure periodicity to the sum of the absolute values of plasmon power fluxes propagating in both directions, could reach up to 80 percent. Two different methods of the plasmon propagation direction switching are studied and possible application of the found effects are suggested.
format	article
author	Mikhail Yu. Morozov Vyacheslav V. Popov Denis V. Fateev
author_facet	Mikhail Yu. Morozov Vyacheslav V. Popov Denis V. Fateev
author_sort	Mikhail Yu. Morozov
title	Electrically controllable active plasmonic directional coupler of terahertz signal based on a periodical dual grating gate graphene structure
title_short	Electrically controllable active plasmonic directional coupler of terahertz signal based on a periodical dual grating gate graphene structure
title_full	Electrically controllable active plasmonic directional coupler of terahertz signal based on a periodical dual grating gate graphene structure
title_fullStr	Electrically controllable active plasmonic directional coupler of terahertz signal based on a periodical dual grating gate graphene structure
title_full_unstemmed	Electrically controllable active plasmonic directional coupler of terahertz signal based on a periodical dual grating gate graphene structure
title_sort	electrically controllable active plasmonic directional coupler of terahertz signal based on a periodical dual grating gate graphene structure
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/6cc2e024736d4b0db56e10d0cfa29017
work_keys_str_mv	AT mikhailyumorozov electricallycontrollableactiveplasmonicdirectionalcouplerofterahertzsignalbasedonaperiodicaldualgratinggategraphenestructure AT vyacheslavvpopov electricallycontrollableactiveplasmonicdirectionalcouplerofterahertzsignalbasedonaperiodicaldualgratinggategraphenestructure AT denisvfateev electricallycontrollableactiveplasmonicdirectionalcouplerofterahertzsignalbasedonaperiodicaldualgratinggategraphenestructure
_version_	1718389083919613952

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

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