High-Speed Graphene Photodetection: 300 GHz is not the Limit

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.