- Plasmonic and bolometric terahertz detection by graphene field-effect transistor doi link

Auteur(s): Muraviev A. V., Rumyantsev S. L., Liu G., Balandin A. A., Knap W., Shur M. S.

(Article) Publié: Applied Physics Letters, vol. 103 p.181114 (2013)
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Ref HAL: hal-00954517_v1
DOI: 10.1063/1.4826139
WoS: 000327816000008
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Polarization dependence analysis of back-gated graphene field-effect transistor terahertz responsivity at frequencies ranging from 1.63 to 3.11 THz reveals two independent mechanisms of THz detection by graphene transistor: plasmonic, associated with the transistor nonlinearity, and bolometric, caused by graphene sheet temperature increase due to THz radiation absorption. In the bolometric regime, electron and hole branches demonstrate a very different response to THz radiation, which we link to the asymmetry of the current-voltage characteristics temperature dependence with respect to the Dirac point. Obtained results are important for development of high-efficiency graphene THz detectors.