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

Jingshu Guo; Jiang Li; Chaoyue Liu; Yanlong Yin; Wenhui Wang; Zhenhua Ni; Zhilei Fu; Hui Yu; Yang Xu; Yaocheng Shi; Yungui Ma; Shiming Gao; Limin Tong; Daoxin Dai

doi:10.1038/s41377-020-0263-6

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

Light Sci Appl. 2020 Feb 28:9:29. doi: 10.1038/s41377-020-0263-6. eCollection 2020.

Authors

Jingshu Guo^#^{1

2}, Jiang Li^#¹, Chaoyue Liu¹, Yanlong Yin¹, Wenhui Wang³, Zhenhua Ni³, Zhilei Fu⁴, Hui Yu⁴, Yang Xu^{2

4}, Yaocheng Shi^{1

2}, Yungui Ma¹, Shiming Gao^{1

2}, Limin Tong¹, Daoxin Dai^{1

2}

Affiliations

¹ 1State Key Laboratory for Modern Optical Instrumentation, Zhejiang Provincial Key Laboratory for Sensing Technologies, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Zhejiang University, Zijingang Campus, 310058 Hangzhou, China.
² 2Ningbo Research Institute, Zhejiang University, 315100 Ningbo, China.
³ 3Department of Physics and Key Laboratory of MEMS of the Ministry of Education, Southeast University, 211189 Nanjing, China.
⁴ 4College of Information Science and Electronic Engineering, Zhejiang University, 310027 Hangzhou, Zhejiang China.

^# Contributed equally.

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.

Keywords: Integrated optics; Optical properties and devices; Silicon photonics.