New research led by Exeter University has shown how the unique properties of graphene can be used to create artificial structures that can control and manipulate electromagnetic radiation over different wavelengths.
A team of international scientists, led by Exeter’s Prof Geoff Nash have engineered a new hybrid structure - or metamaterial - that is claimed to possess specific characteristics that are not found in natural materials.
According to the university, the team combined nano-ribbons of graphene, in which electrons are able to oscillate backwards and forwards, together with a split ring resonator, which is a type of antenna.
Careful design of these two elements leads to a system that interacts strongly with electromagnetic radiation. In these experiments the team used light with very long wavelengths to show that these new structure can be used as a type of optical switch to interrupt, and turn on and off, a beam of this light very quickly.
The collaborative international research included Dr Sergey Mikhailov at the University of Augsburg, Germany, and Prof Jérôme Faist at ETH Zurich.
In a statement, Prof Geoff Nash, from Exeter University’s Department of Engineering said: “In these novel results we demonstrate a new type of structure which can be used not only as an exciting test bed to explore the underlying new science, but that could form the basis of a range of technologically important components.”
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