宽频近零等效介电常数超材料及其在光场调控中的应用(特邀)  

Broadband Epsilon-near-zero Metamaterials and Its Application in Optical Field Manipulation(Invited)

作　　者：孙磊[1] 汪国平 SUN Lei;WANG Guoping(Institute of Microscale Optoelectronics,Shenzhen University,Shenzhen,Guangdong 518060,China)

机构地区：[1]深圳大学微纳光电子学研究院,广东深圳518060

出　　处：《光子学报》2022年第1期124-140,共17页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.11734012,12074267,12174265);广东省重点领域研发计划项目(No.2020B010190001)。

摘　　要：近零等效介电常数超材料以其近乎等于零的等效介电常数所赋予的电磁特性使其在理论研究和工程应用中均有可观的价值,是电磁超材料领域研究热点之一。本文系统总结了为了解决现有近零介电常数超材料工作频率单一的不足,以等效介质理论的Bergman-Milton谱表述理论为基础,结合超材料典型微观结构等效介电常数谱表述的特点,建立宽频近零介电常数超材料的谱表述理论,并以此为基础设计具有宽频近零介电常数超材料的研究成果。理论上,对超材料的材料特性和微观结构特性抽象化,实现了对具备超晶格构型的宽频近零介电常数超材料的快速建构,解释了宽频近零介电常数的物理原理,并获得了数值模拟的验证。同时,在应用方面,根据宽频近零介电常数超材料的物理特性,突出展示了所设计的宽频近零介电常数超材料在宽频电磁隧穿与聚焦、宽频电磁波定向发射、宽频电磁波波前调制等方面的应用。Since the beginning of metamaterial research,epsilon-near-zero metamaterials have long been a research hotspot in the field of electromagnetic metamaterials because of the electromagnetic features granted by their near-zero effective permittivity,making them interesting in both theoretical studies and technical applications. To achieve the near-zero effective permittivity response,in short,the current epsilon-near-zero metamaterial research follows three fundamental theories,the waveguide theory,the band structure theory for photonic crystals,and the effective medium theory. In general,the waveguide theory makes the epsilon-near-zero metamaterials operate as a waveguide at the cut-off frequency,while the band structure theory makes the epsilon-near-zero metamaterials perform as a photonic crystal at the frequency of the Dirac point. On the other hand,the effective medium theory follows another principle of the cancellation of the positive permittivity and the negative permittivity of different components of the epsilon-near-zero metamaterials at a specific frequency. All three theories strongly depend on the electromagnetic properties and the microstructures of the components in the epsilon-near-zero metamaterials, which also limits the near-zero permittivity response frequency. In brief, the single operating frequency and operating mode caused by the inherent limitation of these theories is always a bottleneck preventing further applications of the epsilon-near-zero metamaterials. Therefore,how to break through the limitations,to realize the broadband near-zero permittivity response of metamaterials under multi-stimulation modes,to master its physical principles,and to establish a new theoretical framework are of great significance in theoretical research and application development. In this work,we present a systematic review of our research on broadband epsilon-near-zero metamaterials to address the single operating frequency issue of current epsilon-near-zero metamaterials. In our research,we establish a spec

关 键 词：超材料 超表面 超晶格 复合介质 等效介质理论 Bergman-Milton谱表述理论 电磁隧穿 

分 类 号：O441.6[理学—电磁学]