超宽带高吸收超材料太阳能吸收器设计  

Design of Ultra-Broadband and High-Absorption Metamaterial Solar Absorber

作　　者：王杨 轩雪飞 朱路[2] 朱家兵 沈晓波 高强 胡昌俊 Wang Yang;Xuan Xuefei;Zhu Lu;Zhu Jiabing;Shen Xiaobo;Gao Qiang;Hu Changjun(School of Electronic Engineering,Huainan Normal University,Huainan 232038,Anhui,China;School of Information Engineering,East China Jiaotong University,Nanchang 330013,Jiangxi,China)

机构地区：[1]淮南师范学院电子工程学院,安徽淮南232038 [2]华东交通大学信息工程学院,江西南昌330013

出　　处：《中国激光》2022年第9期18-29,共12页Chinese Journal of Lasers

基　　金：国家自然科学基金(61967007,61963016);国防科技重点实验室基金研究项目(6142113180101);教育部人文社会科学研究规划基金(18YJAZH150);江西省重点研发计划重点项目(20201BBF61012);安徽省科技重大专项(202003a05020031);安徽省重点研发计划(202004a05020023);淮南市科技计划项目(2021A2411);淮南师范学院校级科研项目(2020XJYB005,2019XJYB06,2020XJYB001)。

摘　　要：基于阻抗匹配理论与组合谐振结构特性,设计了一种超宽带超材料太阳能吸收器。该吸收器由栅格结构与金属/介质/金属堆叠结构组合而成,组合结构有效拓展了吸收带宽。采用时域有限差分法分析了吸收器的吸收特性,结果表明:该吸收器在300~4000nm波段内的平均吸收率可达94.9%,吸收带宽为3700nm,可有效覆盖可见光与红外光波段。该吸收器在整个吸收波段范围内具有一定的偏振独立特性,以60°广角斜入射时,平均吸收率仍可达到93%。谐振频点处的电磁场分布表明,该吸收器的超宽带高吸收特性主要归因于表面等离子体共振、局域表面等离子体共振、慢波效应、法布里-珀罗共振,以及共振模式间的杂化耦合作用。所提超宽带高吸收太阳能吸收器在许多超材料领域具有潜在的应用价值。Objective The metamaterial absorber is a device that achieves high-efficiency absorption of electromagnetic waves within a specific frequency range by adopting a metamaterial structure.The design of metamaterial absorbers with their perfect absorbance at a specific frequency has attracted widespread attention since it was first proposed by Landy in 2008.The absorption band of the absorber exists within the micro wave band,terahertz band,visible light band,near-infrared band,and far-infrared band,etc.Metamaterial absorbers are used in biological imaging,material detection,medical spectroscopy,invisible equipment,solar cells,communications,and other fields that play an important role.According to research,solar radiation energy is mainly concentrated in wavebands,visible light,and infrared light.The study of the perfect metamaterials’absorber that can cover the visible light and infrared light bands is of great significance for the development and utilisation of solar energy.Researchers used metamaterial absorbers designed with metal rectangles,gold cylinders,and nested metal rings to achieve perfect single-frequency/dual-frequency absorption in the THz band.In addition,the multilayer stack structure was also designed to expand the absorption bandwidth,such as metal/medium/metal,dielectric/metal/medium,and combinations of various shapes.However,there are still limitations in the design of metamaterial absorbers such as narrow absorption bandwidth,complex structure,and high metal cost.We hope to design a metamaterial absorber with an absorption band covering the visible and infrared ranges,and understand the physical mechanism of its absorption characteristics,and improve the absorption of solar energy.Methods Using titanium and gallium arsenide,we designed a metamaterial solar absorber with combined structural characteristics.First,the impedance matching effect of the metal/dielectric/metal multilayer structure was analysed based on the impedance matching theory.Then,the influence of the grid structure on the abs

关 键 词：材料 超材料 太阳能吸收器 高吸收率 超宽带 

分 类 号：O431[机械工程—光学工程]