Ultra-compact integrated graphene plasmonic photodetector with bandwidth above 110 GHz

Yunhong Ding*, Zhao Cheng, Xiaolong Zhu, Kresten Yvind, Jianji Dong, Michael Galili, Hao Hu, N. Asger Mortensen, Sanshui Xiao, Leif Katsuo Oxenløwe

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Graphene-based photodetectors, taking advantage of the high carrier mobility and broadband absorption in graphene, have recently seen rapid development. However, their performance with respect to responsivity and bandwidth is still limited by the weak light-graphene interaction and large resistance-capacitance product. Here, we demonstrate a waveguide-coupled integrated graphene plasmonic photodetector on a silicon-on-insulator platform. Benefiting from plasmon-enhanced graphene-light interaction and subwavelength confinement of the optical energy, a small-footprint graphene-plasmonic photodetector is achieved working at the telecommunication window, with a large a bandwidth beyond 110 GHz and a high intrinsic responsivity of 360 mA/W. Attributed to the unique electronic band structure of graphene and its ultra-broadband absorption, operational wavelength range extending beyond mid-infrared, and possibly further, can be anticipated. Our results show that the combination of graphene with plasmonic devices has great potential to realize ultra-compact, high-speed optoelectronic devices for graphene-based optical interconnects.

Original languageEnglish
Issue number2
Pages (from-to)317-325
Number of pages6
Publication statusPublished - 1 Jan 2020


  • Graphene
  • Photodetector
  • Plasmonic waveguide


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