基于多层石墨烯的高性能宽带红外吸收器

High Performance Broadband Infrared Absorber Based on Multilayer Graphene

石墨烯基复合材料在红外探测隐身方面具有广泛的应用前景,但如何提升其宽带全方位红外吸收特性还缺少系统的研究工作。设计了一种光学介质层与石墨烯层交替分布的二元石墨烯基复合微纳结构红外吸收器,并采用传输矩阵方法系统地研究了其红外吸收特性。结果表明,可通过调控石墨烯层数以及结构周期使红外电磁波在该结构中产生显著的增益和损耗共振耦合效应,在8~14μm全波段内的吸收率高于80%,在10.0~13.3μm波段内的吸收率高于90%,带宽最大为3.3μm。此外,该微纳结构在大角度(0°~60°)斜入射下表现出红外吸收偏振不敏感特性。该研究结果将为新一代石墨烯基柔性宽频带大角度可调谐红外吸收微纳结构的设计与应用提供新思路,也为实现新一代柔性轻质隐身或伪装薄膜材料提供了可行的技术方法与实现途径。

Graphenebased composite materials have broad application prospects in infrared detection stealth,but how to improve its broadband omnidirectional infrared absorption characteristics is still lack of systematic research work.In this paper,a binary graphenebased composite micronano infrared absorber with alternating distribution of optical medium layer and graphene layer is designed,and its infrared absorption characteristics are systematically studied by transmission matrix method.The results show that the resonant coupling effect of gain and loss can be generated in the structure by adjusting the number of graphene layers and the structure.The absorption rate is higher than 80%in the whole band of 8-14μm,higher than 90%in the band of 10.0-13.3μm,and the maximum bandwidth is 3.3μm.In addition,the micronano structure exhibits polarization insensitivity of infrared absorption in wide angle range(0°-60°)with oblique incidence.The results of this study provide a new idea for the design and application of a new generation of graphenebased flexible wideband and largeangle tunable infrared absorption micronano structure,and also provide a feasible technical method and realization path for a new generation of flexible lightweight stealth or camouflage film materials.