二维超颖材料微观电磁耦合机理及宏观电磁均一化理论

Two-dimensional metamaterials (or metasurfaces) have become one hot research topic in information and relevant disciplines. Targeting on the critical issues that conventional homogenization theory fails in modeling properly the electromagnetic properties of metasurfaces and in guiding the design process, this proposed project plans to excavate thoroughly the microscopic mechanism which contributes to the macroscopic responses of metasurfaces, to build up the connections between its microscopic electromagnetic responses and macroscopic electromagnetic properties, and to improve the electromagnetic homogenization theory for metasurfaces. Firstly, based on integration of metasurfaces and their dielectric substrates and other innovative methods introduced into the retrieval procedure, this project intends to propose a homogenization theory for metasurfaces based on the conventional scattering-parameter retrieval method. Secondly, this project plans to connect the microscopic structural dimensions of metasurfaces with their macroscopic electromagnetic responses through the effective electrical and magnetic surface susceptibilities, and hence presents a homogenization theory based on the effective electrical and magnetic surface susceptibilities of metasurfaces. Finally, a field-distribution-induced equivalent-circuit-model-based homogenization theory is proposed to analyze the resonance-related problems of metasurfaces. The expected outcomes of this proposed project could not only provide complete descriptions for metasurfaces from the microscopic electromagnetic coupling effects to macroscopic electromagnetic properties, but may also provide several efficient, accurate, physically reasonable, and widely applicable scientific methods for the design and the optimization of metasurface structures, and furthermore lay a solid theoretical foundation for the practical applications of metasurfaces in communication and information systems.

二维超颖材料（超表面）是目前信息等学科的研究热点。针对传统均一化理论无法有效分析超表面电磁特性和无法指导其设计的缺陷，本课题拟深入挖掘超表面宏观电磁特性的微观机理，尝试建立其微观电磁响应与宏观电磁特性之间的联系，建立和完善针对超表面的宏观电磁均一化理论。首先，通过超表面及其介质基板的集成和逆推过程中新方法的引入，拟提出一种基于传统散射参数法的新型超表面均一化理论。其次，拟通过等效表面电磁极化率建立超表面微观结构与其宏观电磁特性之间的联系，并提出一种基于等效表面电磁极化率的均一化理论。最后，拟提出一种场分布—路等效均一化理论，用于分析超表面谐振问题。本课题的预期研究成果不仅有望实现对具有广阔应用前景的超表面这一新型媒质从微观电磁耦合机理到宏观电磁特性的完整描述，而且可以为超表面的设计和结构优化提供几种高效、准确、具有严格物理意义和广泛适用性的科学手段。为超表面在信息系统中的集成夯实理论基础。

二维超颖材料（超表面）是目前电学、光学、热学、力学等多学科的研究热点。针对传统均一化理论无法有效分析超表面电磁特性和无法指导其设计的缺陷，本课题深入挖掘超表面宏观电磁特性的微观机理，建立了其微观电磁响应与宏观电磁特性之间的联系，针对超表面确立和完善了相关宏观电磁均一化理论。首先，通过超表面及其介质基板的集成和逆推过程中新方法的引入，提出了一种基于传统散射参数法的新型超表面均一化理论。其次，通过等效表面电磁极化率建立超表面微观结构与其宏观电磁特性之间的联系，并提出了一种基于等效表面电磁极化率的均一化理论。最后，提出了场分布—路等效均一化理论，用于分析超表面谐振问题。通过多个超表面透镜实物模型，验证了上述理论和方法的有效性和正确性。依托课题，共发表SCI检索论文15篇，其中中科院top期刊论文8篇；出版专著1部；授权发明专利3项；培养2名博士和多名硕士研究生。