论文标题
石墨烯等离激元分形非材料用于宽带光电探测器
Graphene Plasmonic Fractal Metamaterials for Broadband Photodetectors
论文作者
论文摘要
超材料最近建立了一种新的范式，以增强最先进的光电遗传学的光吸收。在这里，我们基于金/石墨烯sierpinski地毯等离激元分形的新型MetadeVice，在室温下在室温下在室温下进行宽带，高效，对极化的敏感和栅极可调光检测。我们观察到了一个前所未有的内部量子效率，从近红外到可见范围高达100％，其光学探测率的上限为$ 10^{11} $琼斯，增益高达$ 10^{6} $，这是在Graphene In graphene In Craphene photogogoneration的指纹。此外，由于高度聚焦（高达$ | e/e_ {0} | \ oft20 $，用于石墨烯的电磁场$ | e/e_ {0} | \近似于$ | e/e_ {0} | \ of the Migimiral symimimar for the Metasurface诱导的电磁场。我们的发现直接洞悉了有关石墨烯等离激元分形超材料的物理过程。所提出的结构代表了实现宽带，紧凑型和主动平台的有希望的途径，用于未来的光电设备，包括多播生物/化学/光传感器。
Metamaterials have recently established a new paradigm for enhanced light absorption in state-of-the-art photodetectors. Here, we demonstrate broadband, highly efficient, polarization-insensitive, and gate-tunable photodetection at room temperature in a novel metadevice based on gold/graphene Sierpinski carpet plasmonic fractals. We observed an unprecedented internal quantum efficiency up to 100% from the near-infrared to the visible range with an upper bound of optical detectivity of $10^{11}$ Jones and a gain up to $10^{6}$, which is a fingerprint of multiple hot carriers photogenerated in graphene. Also, we show a 100-fold enhanced photodetection due to highly focused (up to a record factor of $|E/E_{0}|\approx20$ for graphene) electromagnetic fields induced by electrically tunable multimodal plasmons, spatially localized in self-similar fashion on the metasurface. Our findings give direct insight into the physical processes governing graphene plasmonic fractal metamaterials. The proposed structure represents a promising route for the realization of a broadband, compact, and active platform for future optoelectronic devices including multiband bio/chemical and light sensors.
