Highly Efficient Dual Band Graphene Plasmonic Photodetector at Optical Communication Wavelengths
Somayeh Yousefi, Maryam Pourmahyabadi, Ali Rostami
Abstract
Graphene has remarkable properties in the optoelectronic field, especially in high speed photodetection. However, the responsivity of the graphene-based photodetectors is limited to tens of mA/W because of the weak absorption of the graphene layer. In this paper, a graphene plasmonic photodetector with high responsivity operating in two optical communication bands (O-band and U-band) is proposed. The combination of the graphene monolayer and the plasmonic structure is used to enhance the light-graphene interaction and consequently to improve the responsivity of the photodetector. The numerical simulation results show that the proposed photodetector has the responsivity of 348 mA/W and 460 mA/W at the wavelengths of 1310 nm and 1675 nm, respectively. Also, this structure exhibits the bandwidth of 60 GHz.