Absorption of THz electromagnetic wave in two mono-layers of graphene

Cole B. Reynolds; M. Shoufie Ukhtary; Riichiro Saito

doi:10.1088/0022-3727/49/19/195306

Absorption of THz electromagnetic wave in two mono-layers of graphene

Cole B. Reynolds, M. Shoufie Ukhtary, Riichiro Saito

SCI - Physics

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

Nearly 100% absorption of an electromagnetic (EM) wave in terahertz (THz) frequency is proposed for a system consisting of two mono-layers of graphene. Here, we demonstrate that the system can almost perfectly absorb an EM wave with frequency of 2 THz, even though we have a low electron mobility of roughly 1000 cm² Vs^-1. The absorption probability is calculated by using the transfer matrix method. We show that the two mono-layers of the graphene system is needed to obtain nearly 100% absorption when the graphene has a relatively low Fermi energy. The absorption dependence on the distance between the graphene layers is also discussed.

Original language	English
Article number	195306
Journal	Journal of Physics D: Applied Physics
Volume	49
Issue number	19
DOIs	https://doi.org/10.1088/0022-3727/49/19/195306
Publication status	Published - 2016 Apr 14

Keywords

electromagnetic wave
graphene
optical absorption

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Acoustics and Ultrasonics
Surfaces, Coatings and Films

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AU - Shoufie Ukhtary, M.

AU - Saito, Riichiro

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AB - Nearly 100% absorption of an electromagnetic (EM) wave in terahertz (THz) frequency is proposed for a system consisting of two mono-layers of graphene. Here, we demonstrate that the system can almost perfectly absorb an EM wave with frequency of 2 THz, even though we have a low electron mobility of roughly 1000 cm2 Vs-1. The absorption probability is calculated by using the transfer matrix method. We show that the two mono-layers of the graphene system is needed to obtain nearly 100% absorption when the graphene has a relatively low Fermi energy. The absorption dependence on the distance between the graphene layers is also discussed.

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