Graphene has emerged as an ultrafast photonic material for on-chip photodetection. However, its atomic thickness limits its interaction with guided optical modes, which in turn weakens the photoresponse of waveguide-integrated graphene photodetectors. Nonetheless, it is possible to enhance the interaction of guided light with graphene by nanophotonic means. Herein, we propose a practical design of a plasmon-enhanced photovoltaic double-graphene detector that is integrated into 5 $\mu$ m long titanium nitride slot waveguides. The use of double-graphene in this configuration yields a high responsivity of 2.18 A/W and more for a 0.5 V bias, across the telecom C-band and beyond. Moreover, the device operates at an ultra-high-speed beyond 100 GHz with an ultra-low noise equivalent power of $<\!35\,$ pW/ $\sqrt{\text{Hz}}$ . The reported features are highly promising and are expected to serve the needs of next-generation optical interconnects.

中文翻译：

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等离子体光伏双石墨烯探测器集成到 TiN 槽波导中

石墨烯已成为用于片上光电检测的超快光子材料。然而，它的原子厚度限制了它与导光模的相互作用，这反过来削弱了波导集成石墨烯光电探测器的光响应。尽管如此，通过纳米光子手段增强导光与石墨烯的相互作用是可能的。在此，我们提出了一种等离子体增强光伏双石墨烯探测器的实用设计，该探测器集成到 5$\mu$ 米长氮化钛槽波导。在这种配置中使用双石墨烯可在电信 C 波段及其他频段产生 2.18 A/W 的高响应率，以及更高的 0.5 V 偏压响应率。此外，该器件以超过 100 GHz 的超高速运行，超低噪声等效功率为$<\!35\,$ 功率/ $\sqrt{\text{Hz}}$ . 报告的功能非常有前途，有望满足下一代光互连的需求。