Room-Temperature Amplification of Terahertz Radiation by Grating-Gate Graphene Structures

We study terahertz (THz) radiation transmission through grating-gate graphene-based nanostructures. We report on room-temperature THz radiation amplification stimulated by current-driven plasmon excitation. Specifically, with an increase of the dc current under periodic charge density modulation, we...

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Autores principales:	Stephane Boubanga-Tombet, Wojciech Knap, Deepika Yadav, Akira Satou, Dmytro B. But, Vyacheslav V. Popov, Ilya V. Gorbenko, Valentin Kachorovskii, Taiichi Otsuji
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2020
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/88ae959e067743ae9fc917e037461794
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spelling	oai:doaj.org-article:88ae959e067743ae9fc917e0374617942021-12-02T13:18:10ZRoom-Temperature Amplification of Terahertz Radiation by Grating-Gate Graphene Structures10.1103/PhysRevX.10.0310042160-3308https://doaj.org/article/88ae959e067743ae9fc917e0374617942020-07-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.10.031004http://doi.org/10.1103/PhysRevX.10.031004https://doaj.org/toc/2160-3308We study terahertz (THz) radiation transmission through grating-gate graphene-based nanostructures. We report on room-temperature THz radiation amplification stimulated by current-driven plasmon excitation. Specifically, with an increase of the dc current under periodic charge density modulation, we observe a strong redshift of the resonant THz plasmon absorption, followed by a window of complete transparency to incoming radiation and subsequent amplification and blueshift of the resonant plasmon frequency. Our results are, to the best of our knowledge, the first experimental observation of energy transfer from dc current to plasmons leading to THz amplification. Additionally, we present a simple model offering a phenomenological description of the observed THz amplification. This model shows that in the presence of a dc current the radiation-induced correction to dissipation is sensitive to the phase shift between oscillations of carrier density and drift velocity. And, with an increasing current, the dissipation becomes negative, leading to amplification. The experimental results of this work, as all obtained at room-temperature, pave the way toward the new 2D plasmon-based, voltage-tunable THz radiation amplifiers.Stephane Boubanga-TombetWojciech KnapDeepika YadavAkira SatouDmytro B. ButVyacheslav V. PopovIlya V. GorbenkoValentin KachorovskiiTaiichi OtsujiAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 10, Iss 3, p 031004 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Stephane Boubanga-Tombet Wojciech Knap Deepika Yadav Akira Satou Dmytro B. But Vyacheslav V. Popov Ilya V. Gorbenko Valentin Kachorovskii Taiichi Otsuji Room-Temperature Amplification of Terahertz Radiation by Grating-Gate Graphene Structures
description	We study terahertz (THz) radiation transmission through grating-gate graphene-based nanostructures. We report on room-temperature THz radiation amplification stimulated by current-driven plasmon excitation. Specifically, with an increase of the dc current under periodic charge density modulation, we observe a strong redshift of the resonant THz plasmon absorption, followed by a window of complete transparency to incoming radiation and subsequent amplification and blueshift of the resonant plasmon frequency. Our results are, to the best of our knowledge, the first experimental observation of energy transfer from dc current to plasmons leading to THz amplification. Additionally, we present a simple model offering a phenomenological description of the observed THz amplification. This model shows that in the presence of a dc current the radiation-induced correction to dissipation is sensitive to the phase shift between oscillations of carrier density and drift velocity. And, with an increasing current, the dissipation becomes negative, leading to amplification. The experimental results of this work, as all obtained at room-temperature, pave the way toward the new 2D plasmon-based, voltage-tunable THz radiation amplifiers.
format	article
author	Stephane Boubanga-Tombet Wojciech Knap Deepika Yadav Akira Satou Dmytro B. But Vyacheslav V. Popov Ilya V. Gorbenko Valentin Kachorovskii Taiichi Otsuji
author_facet	Stephane Boubanga-Tombet Wojciech Knap Deepika Yadav Akira Satou Dmytro B. But Vyacheslav V. Popov Ilya V. Gorbenko Valentin Kachorovskii Taiichi Otsuji
author_sort	Stephane Boubanga-Tombet
title	Room-Temperature Amplification of Terahertz Radiation by Grating-Gate Graphene Structures
title_short	Room-Temperature Amplification of Terahertz Radiation by Grating-Gate Graphene Structures
title_full	Room-Temperature Amplification of Terahertz Radiation by Grating-Gate Graphene Structures
title_fullStr	Room-Temperature Amplification of Terahertz Radiation by Grating-Gate Graphene Structures
title_full_unstemmed	Room-Temperature Amplification of Terahertz Radiation by Grating-Gate Graphene Structures
title_sort	room-temperature amplification of terahertz radiation by grating-gate graphene structures
publisher	American Physical Society
publishDate	2020
url	https://doaj.org/article/88ae959e067743ae9fc917e037461794
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Room-Temperature Amplification of Terahertz Radiation by Grating-Gate Graphene Structures

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