Unveiling the plasma wave in the channel of graphene field-effect transistor

IRMMW-THz 2019 - 44th International Conference on Infrared, Millimeter, and Terahertz Waves, International Conference on Infrared, Millimeter, and Terahertz Waves

Abstract

Coupling an electromagnetic wave at GHz to THz frequencies into the channel of a graphene field-effect transistor (GFET) provokes collective charge carrier oscillations of the two-dimensional electron gas (2DEG) known as plasma waves. Here, we report the very first experimental and direct mapping of the electric field distribution in a gated GFET at nanometer length scales using scattering-type scanning near-field microscopy (s-SNOM) at 2 THz. Based on the experimental results we deduce the plasma wave velocity for different gate bias voltages, which is in good agreement with the theoretical prediction.

DOI

10.1109/IRMMW-THz.2019.8873874

Citation

Soltani, A, Kuschewski, F, Bonmann, M, Generalov, A, Vorobiev, A, Ludwig, F, Wiecha, M, Cibiraite, D, Walla, F, Kehr, S C, Eng, L M, Stake, J & Roskos, H G 2019, Unveiling the plasma wave in the channel of graphene field-effect transistor. in IRMMW-THz 2019 - 44th International Conference on Infrared, Millimeter, and Terahertz Waves., 8873874, International Conference on Infrared, Millimeter, and Terahertz Waves, IEEE, International Conference on Infrared, Millimeter, and Terahertz Waves, Paris, France, 01/09/2019. https://doi.org/10.1109/IRMMW-THz.2019.8873874

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https://urn.fi/URN:NBN:fi:aalto-202001021358

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[article-cris] Sähkötekniikan korkeakoulu / ELEC

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Unveiling the plasma wave in the channel of graphene field-effect transistor

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