Low-bias gate tunable terahertz plasmonic signatures in chemical vapour deposited graphene of varying grain size

Varun S. Kamboj, Philipp Braeuninger-Weimer, Piran R. Kidambi, David S. Jessop, Angadjit Singh, Juraj Sibik, Yuan Ren, Stephan Hofmann, J. Axel Zeitler, Harvey E. Beere, David A. Ritchie, Laurence P. Sadwick (+1 others)
2016 Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications IX  
We report the characterization of centimeter sized graphene field-effect transistors with ionic gating which enables active frequency and amplitude modulation of terahertz (THz) radiation. Chemical vapour deposited graphene with different grain sizes were studied using THz time-domain spectroscopy. We demonstrate that the plasmonic resonances intrinsic to graphene can be tuned over a wide range of THz frequencies by engineering the grain size of the graphene. Further frequency tuning of the
more » ... nance, up to ~65 GHz, is achieved by electrostatic doping via ionic gating. These results present the first demonstration of tuning the intrinsic plasmonic resonances in graphene.
doi:10.1117/12.2209724 fatcat:rl6bcajtejfmdbp5gcx67henta