Ultra-compact graphene plasmonic photodetector with the bandwidth over 110GHz

TL;DR

This paper demonstrates an ultra-compact graphene plasmonic photodetector on silicon-on-insulator with over 110GHz bandwidth and high responsivity, leveraging plasmonic enhancement and graphene's broadband absorption.

Contribution

It introduces a waveguide-coupled graphene plasmonic photodetector with subwavelength confinement, achieving high bandwidth and responsivity on a silicon platform.

Findings

Bandwidth exceeds 110GHz

Intrinsic responsivity of 360mA/W

Potential for broadband operation beyond mid-infrared

Abstract

Graphene-based photodetectors, taking advantage of high carrier mobility and broadband absorption in graphene, have recently experienced rapid development. However, their performances with respect to the responsivity and bandwidth are still limited by either weak light-graphene interaction or large resistance-capacitance product. Here, we demonstrate a waveguide coupled integrated graphene plasmonic photodetector on the silicon-on-insulator platform. Benefiting from plasmonic enhanced graphene-light interactions and subwavelength confinement of the optical energy, we present a small-footprint graphene-plasmonic photodetector with bandwidth beyond 110GHz and intrinsic responsivity of 360mA/W. Attributed to the unique electronic bandstructure of graphene and its ultra-broadband absorption, the 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 and high-speed optoelectronic devices for graphene-based optical interconnects.