Tunable graphene based plasmonic absorber with grooved metal film in near infrared region
Tunable graphene based plasmonic absorber with grooved metal film in near infrared region
复制标题
DOI：
10.1016/j.optcom.2017.04.025
复制
发表时间：
2017-09
影响因子：
2.4
通讯作者：
M. Zare;N. Nozhat;Reza Rashiditabar
中科院分区：
文献类型：
--
作者：
M. Zare;N. Nozhat;Reza Rashiditabar
在本文中，我们提出了一种基于石墨烯的吸收剂，在近红外波长处具有两个吸收峰。金属-石墨烯纳米结构由带有L形凹槽的金属薄膜上的单层石墨烯组成。结果表明，仅利用一层石墨烯层，由于凹槽中的局域表面等离子体共振 (LSPR) 放大了光和石墨烯的相互作用，结构的吸收率增加到 0.9 以上。我们已经证明，通过减小垂直 L 形凹槽的长度，可以增强吸波器的半高全宽 (FWHM)。此外，所提出结构的吸收光谱可以通过改变石墨烯的几何参数和化学势来调节。
In this paper, we have proposed a graphene based absorber with two absorption peaks at near infrared wavelengths. The metal-graphene nanostructure is composed of a single layer of graphene on a metal film with L-shaped grooves. The results show that by utilizing only one graphene layer the absorption of the structure is increased to more than 0.9 due to the localized surface plasmon resonance (LSPR) in the grooves that amplifies the interaction of light and graphene. We have shown that the full width at half maximum (FWHM) of the absorber is enhanced by decreasing the perpendicular L-shaped grooves length. Also, the absorption spectrum of the proposed structure can be tuned by changing the geometric parameters and chemical potential of graphene.