A Perfect Graphene Absorber with Waveguide Coupled High-Contrast Gratings

被引：0

作者：

张皓景 ^{[1
,2
]}

郑改革 ^{[1
,3
,2
]}

陈云云 ^{[1
,3
,2
]}

邹秀娟 ^{[1
,2
]}

徐林华 ^{[1
,2
]}

机构：

[1] Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean, Nanjing University of Information Science & Technology

[2] School of Physics and Optoelectronic Engineering, Nanjing University of Information Science & Technology

[3] Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology,Nanjing University of Information Science & Technology

来源：

Chinese Physics Letters | 2018年 / 35卷 / 03期

基金：

中国国家自然科学基金;

关键词：

A Perfect Graphene Absorber with Waveguide Coupled High-Contrast Gratings;

D O I：

暂无

中图分类号：

O613.71 [碳C];

学科分类号：

070301 ; 081704 ;

摘要：

To achieve the enhancement and manipulation of light absorption in graphene within the visible and near infrared regions, a design consists of high-contrast gratings and two evanescently coupled slabs with graphene monolayer is demonstrated. The operation principle and design process of the proposed structure are analyzed using the coupled mode theory, which is confirmed by the rigorous coupled wave analysis. It is proved that the absorptance of graphene monolayer can be greatly enhanced to unity. The thickness of grating and slab layers can significantly change the line width and resonant mode position in the absorption spectra. Furthermore, high tunability in amplitude and bandwidth of the absorption spectra can be achieved by controlling the structural parameters of the hybrid structure. The proposed devices could be efficiently exploited as tunable and selective absorbers, and could be allowed to realize other two-dimensional materials-based selective photo-detectors.

引用

页码：109 / 113

页数：5