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.

中文翻译：

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在光通信波长下的高效双带石墨烯等离子光电探测器

石墨烯在光电子领域，特别是在高速光电检测中具有显着的性能。然而，由于石墨烯层的吸收较弱，因此基于石墨烯的光电检测器的响应度被限制在数十mA / W。本文提出了一种在两个光通信频段（O波段和U波段）工作的高响应度石墨烯等离子体激元探测器。石墨烯单层和等离激元结构的组合用于增强光-石墨烯的相互作用，从而提高光电探测器的响应度。数值模拟结果表明，所提出的光电探测器在1310 nm和1675 nm的波长下分别具有348 mA / W和460 mA / W的响应度。而且，这种结构展现出60 GHz的带宽。