Yi Soongyu, Zhou Ming, Shi Xi, Gan Qiaoqiang, Zi Jian, Yu Zongfu
Opt Express. 2015 Apr 20;23(8):10081-90. doi: 10.1364/OE.23.010081.
The interaction between two-dimensional (2D) materials and light is rather weak due to their ultrathin thickness. In order for these emerging 2D materials to achieve performances that are comparable to those of conventional optoelectronic devices, the light-material interaction must be significantly enhanced. An effective way to enhance the interaction is to use optical resonances. Efficient light absorption has been demonstrated in a single layer of graphene based on a variety of resonators. However, the bandwidth of the absorption enhancement is always narrow, which limits its application for optoelectronic devices. In order to broaden the enhancement of light-material interaction, here we propose a multiple-resonator approach based on nanostructured graphene. These nanostructures having different geometry support resonances at different frequencies. Owing to their deep subwavelength sizes, graphene resonators can be closely packed in space, resulting in a high optical density of states, which enables the broadband light absorption.
由于二维（2D）材料的超薄厚度，它们与光之间的相互作用相当微弱。为了使这些新兴的二维材料实现与传统光电器件相当的性能，必须显著增强光与材料之间的相互作用。增强这种相互作用的一种有效方法是利用光学共振。基于各种谐振器，已在单层石墨烯中证明了高效的光吸收。然而，吸收增强的带宽总是很窄，这限制了其在光电器件中的应用。为了拓宽光与材料相互作用的增强范围，在此我们提出一种基于纳米结构石墨烯的多谐振器方法。这些具有不同几何形状的纳米结构在不同频率下支持共振。由于其深亚波长尺寸，石墨烯谐振器可以在空间中紧密堆积，从而导致高光态密度，这使得能够实现宽带光吸收。
