基于连续域束缚态的全介质太赫兹超表面及其等效参数研究  

All-dielectric terahertz metasurface based on bound states in the continuum and the research of its equivalent parameter

作　　者：贾兴宁 王猛 赵悦晗 赵睿琦 逯贵祯[4] Jia Xingning;Wang Meng;Zhao Yuehan;Zhao Ruiqi;Lu Guizhen(School of Electronic and Electrical Engineering,Ningxia University,Yinchuan,Ningxia 750021,China;School of Integrated Circuit Science and Engineering,Tianjin University of Technology,Tianjin 300384,China;Shandong Key Laboratory of Low-altitude Airspace Surveillance Network Technology,QILU Aerospace Information Research Institute(AIR),Chinese Academy of Sciences(CAS),Jinan,Shandong 250000,China;State Key Laboratory of Media Convergence and Communication,Communication University of China,Beijing 100024,China)

机构地区：[1]宁夏大学电子与电气工程学院,宁夏银川750021 [2]天津理工大学集成电路科学与工程学院,天津300384 [3]中国科学院空天信息创新研究院山东省低空监测网技术重点实验室,山东济南250000 [4]中国传媒大学媒体融合与传播国家重点实验室,北京100024

出　　处：《光电工程》2025年第2期97-107,共11页Opto-Electronic Engineering

基　　金：宁夏重点研发计划(2021BEB04068);宁夏自然科学基金(2024AAC03046)。

摘　　要：本研究提出了一种基于连续域束缚态(bound states in the continuum,BIC)的全介质太赫兹超表面。超表面的每个结构单元由两个横截面为正方形的矩形块和衬底组成。衬底材料为石英,表面矩形块材料为无折射率损耗的硅。矩形块横截面面积的改变破坏了超表面的对称性,激发了准BIC,得到了具有极窄线宽的谐振。采用有限元方法(finite element method,FEM)和控制变量法研究了不同非对称参数、结构参数和材料参数下的透射光谱。同时,对所提出的超表面的Q值进行了计算,其Q值可达1.1006×10^(4),高于列出的相关文献中的Q值。此外,该研究针对目前对全介质超表面等效参数的研究相对较少的局限性,利用S参数提取法计算并分析了所提出的超表面的等效参数,并从该角度初步研究了超表面的物理性质。In this research,an all-dielectric terahertz metasurface based on bound states in the continuum(BIC)is proposed.Each structural unit of the metasurface consists of two rectangle blocks with square cross-sections and a substrate.The substrate material is quartz,and the rectangle block material of the surface is lossless silicon.The symmetry of the metasurface is broken by tchanging the cross-section area of the rectangle block,and the quasi-BIC is excited.The resonance with extremely narrow linewidth is obtained.The transmission spectra with different asymmetric,structural and material parameters are studied using finite element method(FEM)and control variable 4 method.Meanwhile,the Q factor of the proposed metasurface is calculated,which can reach 1.1006×10^(4) and is higher than the Q factors from related listed references.In addition,this study is aimed at the limitations of the relatively limited research on the equivalent parameters of all-dielectric metasurfaces,the S-parameter extraction method is utilized to calculate and analyze the equivalent parameters of the proposed metasurface and the physical properties of the metasurface is studied from this perspective preliminarily.

关 键 词：太赫兹超表面 连续域束缚态 全介质 等效参数 

分 类 号：O441.4[理学—电磁学]