基于VO2、NaF和TiO2材料的红外线超宽带吸收器  

Infrared Ultra-Wide-Band Absorber Based on VO_(2),NaF,and TiO_(2)

作　　者：陈宇婷 薛文瑞[1] 张敬 樊浩田 李昌勇[2,3] Chen Yuting;Xue Wenrui;Zhang Jing;Fan Haotian;Li Changyong(College of Physics and Electronic Engineering,Shanxi University,Taiyuan 030006,Shanxi,China;State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Laser Spectroscopy,ShanxiUniversity,Taiyuan 030006,Shanxi,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,Shanxi,China)

机构地区：[1]山西大学物理电子工程学院,山西太原030006 [2]山西大学激光光谱研究所量子光学与光量子器件国家重点实验室,山西太原030006 [3]山西大学极端光学协同创新中心,山西太原030006

出　　处：《中国激光》2023年第6期184-193,共10页Chinese Journal of Lasers

基　　金：国家自然科学基金(61378039,61575115);国家基础科学人才培养基金(J1103210)。

摘　　要：设计了一种基于VO_(2)、NaF和TiO_(2)材料的红外线超宽带可调吸收器,并采用有限元方法对其吸收特性进行了分析。结果表明:当入射波垂直入射时,吸收率对偏振角不敏感。在21~25μm及35~43μm波长范围内,吸收率可以达到99.8%。在12~51μm范围内,吸收率可以达到90%。在0~55°入射角范围内,横磁(TM)波在12~52μm波长范围内,横电(TE)波在20~45μm波长范围内,吸收率均可达到80%以上。获得宽带吸收的主要原因是表面等离子体共振效应。通过改变VO_(2)的电导率,可以调节吸收器的吸收率,实现吸收率的可调性。所设计的红外线超宽带吸收器具有优良的吸收性能,在传感、探测及能量收集和转化等方面具有潜在的应用价值。Objective Electromagnetic wave absorbers operating in the microwave,THz,infrared,visible,and ultraviolet bands have become a prevalent research topic.The typical electromagnetic wave absorber is a vertically stacked multilayer structure based on a metal-dielectric-metal(MIM)structure.The optical characteristics of metal,semiconductor,and new materials can be utilized to optimize the absorption of incoming electromagnetic waves.Absorption mechanisms such as local plasmon resonance,magnetic polariton resonance,surface plasma resonance,Fabry-Perot cavity resonance,and guide mode resonance can be used to realize ideal absorption effects.Infrared absorbers with efficient,broadband,and tunable properties are urgently required in optical sensors,photothermal energy converters,imaging,and infrared stealth cloaks.However,in practical applications,achieving a broadband response in the infrared band is difficult.Most proposed infrared absorbers are limited to the near-infrared(NIR)range and are untunable.Therefore,an ultra-broadband tunable absorber operating from near-infrared to far-infrared is proposed,and its absorption mechanism is analyzed.Methods An infrared broadband absorber is designed based on the phase material VO_(2),metalloids,and high-temperature resistance materials NaF and TiO_(2).First,owing to the unique properties of the materials,the material properties are set based on the role and characteristics of different materials.The ports at the upper and lower ends along the z-direction are set separately,the port type is periodic,and the two ports are set to open and close,respectively.Second,the domains,boundaries,and edges of the different materials in the structure are meshed in detail.Parametric sweeping is then performed according to the study band,and the electric field distribution and the magnetic field are obtained.Finally,the optimal result is obtained through repeated calculations by adjusting the structural geometric parameters,angle of incidence,and polarization angles of the transverse electric(

关 键 词：表面光学 红外线吸收器 宽带 VO_(2) NAF TiO_(2) 表面等离子共振 

分 类 号：O431[机械工程—光学工程]