Abstract Graphene has some outstanding properties in the photoelectric field, especially ultra fast response and broad spectrum absorption, which have led to strong attraction on graphene photodetector. However, the photoresponsivity of pure graphene device is below 10 mA W−1. It would limit the application of graphene photodetector. Here, we design a metamaterial structure with a broadband high absorption spectrum. And by integrating it into the graphene photodetector, the high photoresponsivity of a pure graphene photodetector in a broadband range could be acquired. The photoresponsivity of photodetector can achieve nearly 200 mA W−1, which is two orders higher than the one of pure monolayer graphene photodetector. Besides, the photodetector also keeps the broadband photoresponse. The hot carriers can be generated by coupling of multiple resonances and effectively transported to graphene with the advantage of ultrathin metal film. Based on this work, more potential applications of graphene photodetector could be developed in some related fields.

中文翻译：

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具有宽带高响应度的超材料光栅集成石墨烯光电探测器

摘要 石墨烯在光电领域具有一些突出的特性，特别是超快响应和广谱吸收，使得石墨烯光电探测器受到了强烈的关注。然而，纯石墨烯器件的光响应低于 10 mA W-1。这将限制石墨烯光电探测器的应用。在这里，我们设计了一种具有宽带高吸收光谱的超材料结构。通过将其集成到石墨烯光电探测器中，可以获得宽带范围内纯石墨烯光电探测器的高光响应性。光电探测器的光响应度可以达到近200 mA W-1，比纯单层石墨烯光电探测器高两个数量级。此外，光电探测器还保持宽带光响应。热载流子可以通过多个共振耦合产生，并利用超薄金属膜的优势有效传输到石墨烯。基于这项工作，可以在一些相关领域开发石墨烯光电探测器更多潜在的应用。