Enhanced microwave-to-terahertz absorption in graphene

Konstantin Batrakov, Polina Kuzhir, Sergey Maksimenko, Nadzeya Volynets, Sofia Voronovich, Alesia Paddubskaya, Gintaras Valusis, Tommi Kaplas, Yuri Svirko, Philippe Lambin

Research output: Contribution to journalArticle

Abstract

Fresnel equations predict that an ultrathin free standing conductive film, thousands times thinner than skin depth, is capable to absorb up to 50% of incident electromagnetic radiations. In the microwave range, the same holds true for a free standing graphene sheet. We demonstrate theoretically and prove experimentally that microwave absorptance of graphene can be enhanced considerably by depositing graphene on a dielectric substrate. On the experimental side, we obtain 80% and 65% absorptance at 30GHz and 1 THz, respectively. Theory predicts that higher absorptance can be achieved with a suitable choice of the dielectric permittivity and the thickness of the substrate. Absorption can also be maximized by choosing the optimum incidence angle for s-polarized waves in free space or by working in the vicinity of the cut-off frequency of the transverse electric mode in waveguide configuration. The polarization sensitivity of the transmittance and reflectance of graphene layers can be used to tune the polarization state of the transmitted and reflected radiations.
Original languageEnglish
Article number123101
Number of pages3
JournalApplied Physics Letters
Volume108
DOIs
Publication statusPublished - 21 Mar 2016

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absorptance
graphene
microwaves
polarization
transmittance
electromagnetic radiation
cut-off
incidence
permittivity
waveguides
radiation

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Batrakov, Konstantin ; Kuzhir, Polina ; Maksimenko, Sergey ; Volynets, Nadzeya ; Voronovich, Sofia ; Paddubskaya, Alesia ; Valusis, Gintaras ; Kaplas, Tommi ; Svirko, Yuri ; Lambin, Philippe. / Enhanced microwave-to-terahertz absorption in graphene. In: Applied Physics Letters. 2016 ; Vol. 108.
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Batrakov, K, Kuzhir, P, Maksimenko, S, Volynets, N, Voronovich, S, Paddubskaya, A, Valusis, G, Kaplas, T, Svirko, Y & Lambin, P 2016, 'Enhanced microwave-to-terahertz absorption in graphene' Applied Physics Letters, vol. 108, 123101. https://doi.org/10.1063/1.4944531

Enhanced microwave-to-terahertz absorption in graphene. / Batrakov, Konstantin; Kuzhir, Polina; Maksimenko, Sergey; Volynets, Nadzeya; Voronovich, Sofia; Paddubskaya, Alesia; Valusis, Gintaras; Kaplas, Tommi; Svirko, Yuri; Lambin, Philippe.

In: Applied Physics Letters, Vol. 108, 123101, 21.03.2016.

Research output: Contribution to journalArticle

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AU - Batrakov, Konstantin

AU - Kuzhir, Polina

AU - Maksimenko, Sergey

AU - Volynets, Nadzeya

AU - Voronovich, Sofia

AU - Paddubskaya, Alesia

AU - Valusis, Gintaras

AU - Kaplas, Tommi

AU - Svirko, Yuri

AU - Lambin, Philippe

PY - 2016/3/21

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AB - Fresnel equations predict that an ultrathin free standing conductive film, thousands times thinner than skin depth, is capable to absorb up to 50% of incident electromagnetic radiations. In the microwave range, the same holds true for a free standing graphene sheet. We demonstrate theoretically and prove experimentally that microwave absorptance of graphene can be enhanced considerably by depositing graphene on a dielectric substrate. On the experimental side, we obtain 80% and 65% absorptance at 30GHz and 1 THz, respectively. Theory predicts that higher absorptance can be achieved with a suitable choice of the dielectric permittivity and the thickness of the substrate. Absorption can also be maximized by choosing the optimum incidence angle for s-polarized waves in free space or by working in the vicinity of the cut-off frequency of the transverse electric mode in waveguide configuration. The polarization sensitivity of the transmittance and reflectance of graphene layers can be used to tune the polarization state of the transmitted and reflected radiations.

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Batrakov K, Kuzhir P, Maksimenko S, Volynets N, Voronovich S, Paddubskaya A et al. Enhanced microwave-to-terahertz absorption in graphene. Applied Physics Letters. 2016 Mar 21;108. 123101. https://doi.org/10.1063/1.4944531