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
Summary
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
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