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

Nanophotonics

article

Yunhong Ding¹  Sanshui Xiao¹  Leif Katsuo Oxenløwe¹  Zhao Cheng¹  Xiaolong Zhu⁵  Kresten Yvind¹  Jianji Dong⁴  Michael Galili¹  Hao Hu¹  N. Asger Mortensen⁶ 

[1] Department of Photonics Engineering, Technical University of Denmark;Center for Silicon Photonics for Optical Communication (SPOC), Technical University of Denmark;Center for Nanostructured Graphene (CNG), Technical University of Denmark;Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology;Department of Micro- and Nanotechnology, Technical University of Denmark;Center for Nano Optics and Danish Institute for Advanced Study, University of Southern Denmark, Campusvej 55

关键词: photodetector;    graphene;    plasmonic waveguide;   

DOI  :  10.1515/nanoph-2019-0167

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

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.

【 授权许可】

CC BY