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Regular version of the site

Article

Manifestation of plasmonic response in the detection of sub-terahertz radiation by graphene-based devices

Nanotechnology. 2018. Vol. 29. No. 24. P. 245204-245212.
Gayduchenko I., Fedorov G., Moskotin M., Yagodkin D., Seliverstov S., Goltsman G., Kuntsevich A., Rybin M., Obraztsova E., Leiman V., Shur M., Otsuji T., Ryzhii V.

We report on the sub-terahertz (THz) (129–450GHz) photoresponse of devices based on single
layer graphene and graphene nanoribbons with asymmetric source and drain (vanadium and gold)
contacts. Vanadium forms a barrier at the graphene interface, while gold forms an Ohmic contact.
We find that at low temperatures (77K) the detector responsivity rises with the increasing
frequency of the incident sub-THz radiation. We interpret this result as a manifestation of a
plasmonic effect in the devices with the relatively long plasmonic wavelengths. Graphene
nanoribbon devices display a similar pattern, albeit with a lower responsivity.