High-performance silicon‑graphene hybrid plasmonic waveguide photodetectors beyond 1.55 μm
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.
- Publication:
-
Light: Science & Applications
- Pub Date:
- December 2020
- DOI:
- 10.1038/s41377-020-0263-6
- arXiv:
- arXiv:1907.12498
- Bibcode:
- 2020LSA.....9...29G
- Keywords:
-
- Physics - Applied Physics;
- Physics - Optics
- E-Print:
- 22 pages, 7 figures, 1 table. Supplementary Materials are available