Abstract

Heterostructures combining graphene layers, dielectric slabs and even metallic substrates are interesting systems to look at in view of their potential applications in microwaves and terahertz. A short review of their properties is presented, together with possible applications such as shielding layers, polarizers and plasmonic devices. In the near infrared and visible range, a graphene layer modifies the Brewster angle of the substrate that supports it. This effect leads to a non-destructive technique to count the number of atomic planes the graphene is made of.

Highlights

  • Graphene is a genuine two-dimensional material with remarkable properties in many domain, including electromagnetism

  • When deposited on a flat dielectric surface, graphene modifies the Brewster angle of the air/substrate interface. This modification can be measured by ellipsometry and used for non-contact optical conductivity characterization [2]

  • A conducting layer with thickness much smaller than the skin depth can absorb a substantial fraction of em radiations [9]. This property can readily be caught from eq 2 in the particular case of normal incidence

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Summary

Introduction

Graphene is a genuine two-dimensional material with remarkable properties in many domain, including electromagnetism. In the infra-red range and a large part of the visible spectrum, a single atomic plane of graphene absorbs 2.3% of the incident radiation at normal incidence. This fraction changes with increasing incidence angle and depends on the polarization [1]. When deposited on a flat dielectric surface, graphene modifies the Brewster angle of the air/substrate interface. This modification can be measured by ellipsometry and used for non-contact optical conductivity characterization [2]. A few layers of graphene separated by ultrathin polymer sheets constitute an interesting passive device for GHz applications [4] Shielding layers, polarizers, and absorbing screens are among the few examples that will be described in this short review

Formalism
Absorbing layers
Microwave polarizer
Modification of the Brewster angle
Findings
Plasmonics
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