基于衰减全内反射的外尔半金属耦合性质研究  

Research on coupling properties of weyl semimetals based on attenuated total internal reflection

作　　者：顾梓恒 臧强[1,2] 郑改革 GU Ziheng;ZANG Qiang;ZHENG Gaige(School of Automation,Nanjing University of Information Science and Technology,Nanjing 210044,China;Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology,Nanjing 210044,China;School of Physics and Optoelectronic Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China)

机构地区：[1]南京信息工程大学自动化学院,江苏南京210044 [2]江苏省大气环境与装备技术协同创新中心,江苏南京210044 [3]南京信息工程大学物理与光电工程学院,江苏南京210044

出　　处：《光学技术》2024年第3期320-324,共5页Optical Technique

基　　金：国家自然科学基金面上项目(42375127);江苏省自然科学基金面上项目(BK20191396)。

摘　　要：外尔半金属(WSM)具有独特的体能带结构以及非平庸的表面态,对其光学性能的揭示和研究对认识这类材料和拓展相关应用有具有重要意义。为了探究光与WSM的相互作用,提出了一种衰减全内反射结构用于研究WSM中表面等离激元(SPP)的色散和耦合性质。从介电函数张量出发,通过各项异性传输矩阵来求解麦克斯韦方程组,得到菲涅尔反射系数,研究WSM的色散曲线。在此基础上,引入亚波长厚度的极化晶体薄膜,通过介电函数近零(ENZ)模式和SPP的共同激发,得到两者的耦合杂化色散曲线。研究结果表明,色散关系的高频和低频分支在反交叉点都显示出强耦合。基于WSM的耦合杂化模式具有高度传播特性和亚波长光限制的特点,可以作为未来红外光电子器件的制备和应用提供理论依据。Weyl semimetals(WSMs)have unique bulk energy band structures and non-trivial surface states.The revelation and study of their optical properties are of great significance for understanding this kind of materials and expanding related applications.In order to explore the interaction between light and WSM,an attenuated total internal reflection structure is proposed to study the dispersion and coupling properties of WSM.Starting from the dielectric function tensor,the anisotropic transmission matrix is used to solve Maxwell's equations,and the Fresnel reflection coefficient is obtained to study the dispersion properties of WSM.On this basis,a polar crystal film with a subwavelength thickness is introduced,and the hybrid dispersion curve is obtained through the co-excitation of the dielectric function epsilon-near-zero(ENZ)mode and the surface plasmon polaritons.The findings show that both high-frequency and low-frequency branches of the dispersion relation exhibit strong coupling at the anti-crossing point.The WSM-based coupled hybrid mode has the characteristics of high propagation characteristics and subwavelength light confinement,which can provide a theoretical basis for the preparation and application of future infrared optoelectronic devices.

关 键 词：衰减全内反射 外尔半金属 介电函数近零 耦合 

分 类 号：O436.3[机械工程—光学工程] TN256[理学—光学]