Abstract

Recent advances in graphene-based photodetectors have demonstrated the feasibility of utilizing graphene as a fantastic material for the development of future high-performance photodetectors. In this paper, a high-performance graphene-based photodetector is proposed with plasmonic structure by employing a single graphene layer, periodic metal nano-grating, and ${\rm{Si}}/{\rm{Si}}{{\rm{O}}_2}$ substrate. The plasmonic coupling phenomena between graphene and the metal nano-grating can cause absorption enhancement in this structure. The proposed structure has almost perfect absorption at the telecommunication wavelength (1.55 µm), and its optical response shows a polarization-sensitive characteristic in the spectral range from 1 µm to 2.1 µm. Moreover, the electrical characterization and the dynamic response of this structure are obtained. Based on simulation results, the proposed structure under 0.5 mW incident optical power and at a wavelength of 1.55 µm exhibits a low dark current on the order of about 0.001 mA, maximum photocurrent of 0.81 mA, and responsivity of 1650 mA/W at a bias voltage of 3 V. Also, the rise time of the dynamic response is determined to be about 87 ps, and the 3 dB bandwidth of the frequency response is obtained to be about 4 GHz.

© 2021 Optical Society of America

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