Near-field infrared response of graphene on copper substrate
Near-field infrared response of graphene on copper substrate
复制标题
铜基板上石墨烯的近场红外响应
DOI：
10.1007/s11467-021-1140-3
复制
发表时间：
2022
影响因子：
7.5
通讯作者：
Zhiqiang Li
中科院分区：
文献类型：
--
作者：
Zhen-Bing Dai;Gui Cen;Zhibin Zhang;Xinyu Lv;Kaihui Liu;Zhiqiang Li
石墨烯的电子性质对其介电环境非常敏感。与金属衬底的耦合可以在石墨烯中产生许多新的量子效应，例如带重整化和具有不寻常性质的等离子体激元，这些都具有很高的技术兴趣。考虑到它们的能量和长度尺度，红外纳米成像非常适合探索这些效应。在这里，我们报告的近场红外纳米成像研究的石墨烯在铜合成的化学气相沉积。值得注意的是，我们的测量揭示了石墨烯的三种不同类型的近场光学响应，这与在衬底中观察到的近场边缘条纹非常不同。这些结果可以从石墨烯的光学电导率的修改，由于它与衬底的耦合来理解。我们的工作为确定石墨烯/金属系统中石墨烯的近场响应提供了一个框架，并为研究其新物理和潜在应用铺平了道路。
The electronic properties of graphene are very sensitive to its dielectric environment. The coupling to a metal substrate can give rise to many novel quantum effects in graphene, such as band renormalization and plasmons with unusual properties, which are of high technological interest. Infrared nanoimaging are very suitable for exploring these effects considering their energy and length scales. Here, we report near-field infrared nanoimaging studies of graphene on copper synthesized by chemical vapor deposition. Remarkably, our measurements reveal three different types of near-field optical responses of graphene, which are very distinct from the near-field edge fringes observed in the substrate. These results can be understood from the modification of optical conductivity of graphene due to its coupling with the substrate. Our work provides a framework for identifying the near-field response of graphene in graphene/metal systems and paves the way for studying their novel physics and potential applications.