For optical communication, information is converted between optical andelectrical signal domains at a high rate. The devices to achieve such aconversion are various types of electro-optical modulators and photodetectors.These two types of optoelectronic devices, equally important, require differentmaterials and consequently it has been challenging to realize both using asingle material combination, especially in a way that can be integrated on theubiquitous silicon platform. Graphene, with its gapless band structure, standsout as a unique optoelectronic material that allows both photodetection andoptical modulation. Here, we demonstrate a single graphene-based device thatsimultaneously provides both efficient optical modulation and photodetection.The graphene device is integrated on a silicon waveguide and is tunable with agate made from another layer of graphene to achieve near-infraredphotodetection responsivity of 57 mA/W and modulation depth of 64%. This novelmultifunctional device may lead to many unprecedented optoelectronicapplications.
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机译：对于光通信，信息在光和电信号域之间以高速率转换。实现这种转换的器件是各种类型的电光调制器和光电检测器。这两种同等重要的光电器件需要不同的材料，因此使用单一材料组合来实现这两者一直是一个挑战，尤其是可以集成在无处不在的硅平台上。石墨烯具有无隙带结构，是一种独特的光电材料，可同时进行光检测和光调制。在这里，我们演示了一个基于石墨烯的设备，该设备同时提供有效的光调制和光检测。该石墨烯设备集成在硅波导上，并且可以与另一层石墨烯制成的玛瑙一起调谐，以实现57 mA / W的近红外光检测响应度调制深度为64％。这种新颖的多功能设备可能会导致许多前所未有的光电应用。
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