Tunable enhanced optical absorption of graphene using plasmonic perfect absorbers
Tunable enhanced optical absorption of graphene using plasmonic perfect absorbers
复制标题
使用等离子体完美吸收器可调谐增强石墨烯光学吸收
DOI：
10.1063/1.4906996
复制
发表时间：
2015-01-26
影响因子：
4
通讯作者：
Liu, Qing Huo
中科院分区：
文献类型：
--
作者：
Cai, Yijun;Zhu, Jinfeng;Liu, Qing Huo
增强和调控石墨烯的光吸收是石墨烯基光电子器件应用的一个重要问题。为了在可见光区域实现这一目的，我们展示了一种石墨烯光学吸收体的设计，其灵感来自金属-电介质-金属超材料，用于完美吸收电磁波。单层和三层石墨烯的吸光率分别提高到37.5%和64.8%。石墨烯吸收剂显示出偏振依赖性，并容忍宽范围的入射角。此外，石墨烯吸收光谱的峰位置和带宽通过特定的结构配置在宽的波长范围内是可调谐的。这些结果意味着石墨烯与等离子体完美吸收体的组合对于开发先进的纳米光子器件具有很好的潜力。(C)2015 AIP Publishing LLC.
Enhancement and manipulation of light absorption in graphene is a significant issue for applications of graphene-based optoelectronic devices. In order to achieve this purpose in the visible region, we demonstrate a design of a graphene optical absorber inspired by metal-dielectric-metal metamaterial for perfect absorption of electromagnetic waves. The optical absorbance ratios of single and three atomic layer graphene are enhanced up to 37.5% and 64.8%, respectively. The graphene absorber shows polarization-dependence and tolerates a wide range of incident angles. Furthermore, the peak position and bandwidth of graphene absorption spectra are tunable in a wide wavelength range through a specific structural configuration. These results imply that graphene in combination with plasmonic perfect absorbers have a promising potential for developing advanced nanophotonic devices. (C) 2015 AIP Publishing LLC.