镍基复合薄膜太赫兹宽带吸波体制备  

Preparation of Terahertz Broadband Absorber with Nickel-Based Composite Film

作　　者：刘泉钧 胡放荣[1] 张隆辉[1] 江明珠 苏安[2] Liu Quanjun;Hu Fangrong;Zhang Longhui;Jiang Mingzhu;Su An(School of Electronic Engineering and Automation,Guilin University of Electronic Technology,Guilin 541004,Guangxi,China;School of Mathematics and Physics,Hechi University,Hechi 546300,Guangxi,China)

机构地区：[1]桂林电子科技大学电子工程与自动化学院,广西桂林541004 [2]河池学院数理学院,广西河池546300

出　　处：《光学学报》2024年第11期161-168,共8页Acta Optica Sinica

基　　金：国家自然科学基金(62065005);广西自然科学基金(2020GXNSFDA238019)。

摘　　要：实验制备了由镍泡沫、聚二甲基硅氧烷(PDMS)和少层石墨烯组成的镍基复合薄膜(NCF)太赫兹宽带吸波体,采用太赫兹时域光谱仪测试其吸收性能。结果表明,当镍泡沫厚度为0.5 mm、少层石墨烯质量分数为2%时,在0.3~3.5 THz范围内吸收率均高于0.9,且平均吸收率为0.944。此外,NCF在100℃和200℃的高温下,仍能保持稳定的吸收性能,平均吸收率分别为0.966和0.924。同时,测试了1 mm和1.5 mm NCF压至0.5 mm时的吸收性能,结果表明:NCF的吸收性能略有下降,但吸收率仍然保持在0.8以上;不同厚度的镍泡沫通过掺杂不同质量分数的少层石墨烯,可以增大吸收带宽。运用阻抗匹配理论和多重干涉理论对宽带吸收特性进行解释。这种NCF太赫兹宽带吸波体在太赫兹雷达隐身、宽带无线通信和太赫兹成像等领域具有潜在应用价值。Objective With the rapid development of terahertz sources,highly sensitive detectors,and new terahertz functional devices,the practical application fields of terahertz technology are constantly expanding.Terahertz absorbers are of important application value in the fields of high-sensitivity terahertz detectors,terahertz radar stealth,and electromagnetic radiation protection,and they have become a research hotspot in the field of terahertz in the past decade.In this study,we report a nickel-based composite film(NCF)terahertz broadband absorber with an absorptivity of more than 0.9 in the range of 0.17‒3.5 THz,and it still has excellent absorptivity and absorption bandwidth under high temperature and compression.At present,the terahertz absorbers are mainly two-dimensional structures.We use a three-dimensional nickel foam to reduce surface reflection and find that it has a wider absorption bandwidth than two-dimensional structures.At the same time,compared with three-dimensional graphene absorbers and aerogel absorbers,NCFs are easier to prepare,with lower cost,and they can be applied on a large scale.Therefore,our work contributes to the design and fabrication of terahertz broadband absorbers.Methods We prepare NCF terahertz broadband absorbers from nickel foam,polydimethylsiloxane(PDMS),and fewlayer graphene.First of all,we mix the main agent and curing agent of PDMS according to the ratio of 1∶10,put different mass fractions of few-layer graphene into PDMS to prepare PDMS/few-layer graphene mixtures,and stir magnetically for 30 min to mix PDMS and few-layer graphene evenly.Then,we use a pipette to add the mixture dropwise to the surface of the nickel foam and let it stand for 10 min to allow the mixture to fully enter the pores of the nickel foam.Subsequently,a homogenizer is used for spin coating at 500 r/s for 20 s,so as to evenly distribute the mixture in the nickel foam.The mixture is defoamed in a vacuum drying for 30 min.Finally,NCFs can be obtained by placing the PDMS on a thermostatic heating stage

关 键 词：材料 镍基复合薄膜 太赫兹宽带吸波体 温度影响 压缩影响 多重干涉理论 

分 类 号：O436[机械工程—光学工程]