A Broadband Plasmonic Photodetector Based on Graphene‐Black Phosphorus Heterostructure With Enhanced Absorption and Responsivity

ABSTRACT The authors theoretically report a plasmonic photodetector based on graphene‐black phosphorus heterostructure which is capable of operating from visible to mid‐infrared (MIR) wavelengths. The combination of plasmonic nanostructure and graphene‐black phosphorus heterostructure can significantly enhance the absorption, simulation results show that the proposed photodetector is capable of working from 400 nm to 3 μm with ultrahigh responsivity all exceeding 14,000 AW −1 and large modulation bandwidth all over 327 GHz. In addition, by utilising the evident anisotropic characteristics of black phosphorus, the broadband plasmonic photodetector exhibits the angle‐dependent responsivity which can be used to design the customised plasmonic photodetector. The authors believe that the proposed photodetector would provide the new approach to design the broadband and angle‐dependent optoelectronic devices based on 2D materials.