High-Speed Graphene Photodetection: 300 GHz is not the Limit
Stefan M. Koepfli, Michael Baumann, Sascha Giger, Killian Keller, Yannik Horst, Yannick Salamin, Yuriy Fedoryshyn, Juerg Leuthold
Abstract
Graphene’s unique band structure leading to high carrier mobility and broad spectral absorption have successfully been exploited in high-speed photodetectors (PD) [1] . Several demonstrated graphene devices did not show any decline in performance over the tested frequency response even above 100 GHz [1] , [2] leading to speculations on how fast these graphene-based devices can actually be. Some reports indicate thermal- and carrier-based effects in graphene should offer device responses above 300-500GHz [3] , [4] , making graphene a promising material for next generation high-speed optoelectronics integrated into the silicon (Si) photonics platform.