智能场控变换光学全介质隐身斗篷研究

项目名称： 智能场控变换光学全介质隐身斗篷研究

项目编号： No.61275176

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 无线电电子学、电信技术

项目作者： 赵乾

作者单位： 清华大学

项目金额： 92万元

中文摘要： 基于变换光学的电磁隐身斗篷通常由非均匀的金属结构基元构建而成，特定频点或频段的隐身效应限制了其实际应用。本课题拟研究一种基于介电颗粒Mie谐振原理的变换光学隐身斗篷及其外场调控多频隐身行为。由变换光学原理出发，由理论上研究不同阶次的坐标变换函数对柱状理想与简化参数隐身斗篷性能的影响规律；揭示利用电磁波与构建隐身斗篷的介电基元间的相互作用及基元间的耦合效应实现隐身斗篷的物理本质；利用晶体晶胞设计原理，实现电磁参数呈各向异性和梯度分布的全介质Mie谐振电磁超常材料；通过材料介电基元几何尺寸、形状、电磁参数、填充率和空间取向等参数设计实现不同波段（微波和THz波段）全介质隐身斗篷；阐明介电基元等效电磁参数外场响应函数，推演整个隐身斗篷性能动态变化的本征方程，建立隐身效果、散射参数与外场动态调节间的关联。该研究为多频率响应和主动控制隐身斗篷的实现提供了一种新的途径，有重要的学术意义和应用价值。

中文关键词： 变换光学；全介质超材料；隐身斗篷；Mie电磁谐振；可调控

英文摘要： Electromagnetic cloak based on the transformation optics usually consists of non-uniformity metallic unit cells and can conceal an object only at a frequency, which restricts its applications. In this proposal, we will develop a transformation optics cloak based on Mie resonance and study its actively controlled multifrequency effects. Based on the transformation optics, we study how the different order coordinate transformation functions affect the perfect or reduced column cloak, and the mechanisms of all-dielectric cloak using the electromagnetic interactions between the optical wave and the dielectric unit cells, and the coupling between the unit cells. Based on the design of the primitive cell of crystal, the Mie-resonance-based electromagnetic metamaterials with the anisotropy and spatially varying electromagnetic parameters can be designed to satisfy the required constitutive parameters of a cloak and are used to build all-dielectric cloak working at microwave or THz frequencies. The dynamic response functions of the dielectric unit cells and the cloaking performance varying with the external fileds will be derived, and then the relationship between the cloaking effect, scattering parameters and external fields can be built. This proposal offers a new way to realizing the actively controllable cloak with

英文关键词： Transformation optics；All-dielectric metamaterials；Invisible cloak；Mie resonance；Tunable