Tunable dualband light trapping and localization in coupled graphene grating-sheet system at mid-infrared wavelengths
Tunable dualband light trapping and localization in coupled graphene grating-sheet system at mid-infrared wavelengths
复制标题
中红外波长耦合石墨烯光栅片系统中的可调谐双波段光捕获和定位
DOI：
10.1016/j.optcom.2017.09.079
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发表时间：
2018-01-15
影响因子：
2.4
通讯作者：
Zeng, Fanguang
中科院分区：
文献类型：
--
作者：
Ding, Pei;Li, Yan;Zeng, Fanguang
本文通过数值模拟对石墨烯光栅片结构中的光捕获和局域化进行了全面研究，提出了在大面积连续石墨烯单层中实现可控吸收增强和局域化场增强的策略。对于具有强等离子体耦合的结构，在较宽的入射角范围内，石墨烯片在两种不同的红外波长下实现了95%以上的总吸收和60%以上的光吸收。同时，石墨烯片周围的增强电场比入射场强40倍以上。此外，通过改变石墨烯的费米能或石墨烯片与光栅之间的距离，可以获得可调的光捕获和可切换的红外吸收/反射器。这些特性使得耦合石墨烯光栅片可以作为红外传感、光探测和光物质相互作用的平台。(C) 2017 Elsevier B.V.版权所有
This paper presents a comprehensive study of light trapping and localization in graphene grating-sheet structure by numerical simulation, and shows a strategy to realize controllable absorption enhancement and localized field enhancement in a large-area continuous graphene monolayer. For the structure with strong plasmons coupling, more than 95% of total absorption and 60% of optical absorption in graphene sheet are realized at two different infrared wavelengths over a wide incident angle range. Meanwhile, the enhanced E-field around the graphene sheet is over 40 times of magnitude stronger than that of the incident field. Additionally, by changing the Fermi energy of graphene or the distance between the sheet and the grating, adjustable light trapping and switchable infrared absorber/reflector can be obtained. These features enable the coupled graphene grating-sheet to serve as platform for infrared sensing, photodetection and light-matter interactions. (C) 2017 Elsevier B.V. All rights reserved.