High-performance silicon-graphene hybrid plasmonic waveguide photodetectors beyond 1.55 μm.

Light, Science & Applications
Jingshu GuoDaoxin Dai

Abstract

Graphene has attracted much attention for the realization of high-speed photodetection for silicon photonics over a wide wavelength range. However, the reported fast graphene photodetectors mainly operate in the 1.55 μm wavelength band. In this work, we propose and realize high-performance waveguide photodetectors based on bolometric/photoconductive effects by introducing an ultrathin wide silicon-graphene hybrid plasmonic waveguide, which enables efficient light absorption in graphene at 1.55 μm and beyond. When operating at 2 μm, the present photodetector has a responsivity of ~70 mA/W and a setup-limited 3 dB bandwidth of >20 GHz. When operating at 1.55 μm, the present photodetector also works very well with a broad 3 dB bandwidth of >40 GHz (setup-limited) and a high responsivity of ~0.4 A/W even with a low bias voltage of -0.3 V. This work paves the way for achieving high-responsivity and high-speed silicon-graphene waveguide photodetection in the near/mid-infrared ranges, which has applications in optical communications, nonlinear photonics, and on-chip sensing.

References

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Citations

May 2, 2020·Sensors·William O F Carvalho, J Ricardo Mejía-Salazar
Sep 17, 2020·Scientific Reports·Maryam KhodadadiSeyyed Mohammad Mehdi Moshiri
Oct 13, 2020·Light, Science & Applications·Jiayue HanJun Wang
Feb 13, 2021·Optics Letters·Dan YiHon Ki Tsang
Feb 27, 2021·Nanotechnology·Tingting LiuShuyuan Xiao

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Methods Mentioned

BETA
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COMSOL

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