Abstract-Graphene field effect transistor-based terahertz modulator with small operating voltage and low insertion loss

Graphene field effect transistor-based terahertz modulator with small operating voltage and low insertion loss

Jingbo Liu, Pingjian Li, Yuanfu Chen, Xinbo Song, Fei Qi, Binjie Zheng, Jiarui He, Qiye Wen, and Wanli Zhang

In this work, we report a broadband terahertz wave modulator based on a top-gate graphene field effect transistor with polyimide as the gate dielectric on a PET substrate. The transmission of the terahertz wave is modulated by controlling the Fermi level of graphene via the polyimide as the top-gate dielectric material instead of the traditional dielectric materials. It is found that the terahertz modulator can achieve a modulation depth of ∼20.9% with a small operating gate voltage of 3.5 V and a low insertion loss of 2.1 dB.

© 2016 Chinese Laser Press

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