1202.3477 (M. Rabiu et al.)

Terahertz Generation and Amplification in Graphene Nanoribbons in
Multi-frequency Electric Fields    [PDF]

M. Rabiu, S. Y. Mensah, S. S. Abukari

We study theoretically a multi-frequency response of electrons in confined
graphene subject to dc-ac driven fields. We explore the possibility for using
graphene nanoribbons (GNRs) to generate and amplify terahertz (THz) radiations
in electric field domainless regime. We discover two main important schemes of
generation; when the frequencies are commensurate, THz generation is due to
wave mixing and when they are non-commensurate, a single strong field
suppresses space charge instability and any weak signals can get amplified. The
use of graphene as a best substitute for semiconductor nanoelectronic devices
is suggested.

View original: http://arxiv.org/abs/1202.3477