矩形超散射体和超吸收体

Rectangular super-scatterer and super-absorber

超散射体和超吸收体作为新型功能器件受到了人们的广泛关注,然而已有的研究均基于圆柱坐标系,由此得到的电磁参数是非均匀的且各向异性的,给实验带来了极大的困难。针对这一问题,基于坐标变换理论,提出了新型的矩形超散射体和超吸收体,推导出了所需的介电常数和磁导率分布;对矩形超散射体和超吸收体进行了简化研究,提出了一种巧妙的简化方案,去除了材料的非均匀性和各向异性,仅用负折射率材料(均匀的且各向同性的),以便于工程实现;考虑到负折射率材料会有损耗,对引入损耗后的器件性能进行了评估。仿真结果表明,该器件具有很好的鲁棒性。

Super-scatterer and super-absorber,as new functional devices,have been receiving great attention.However,previous studies were based on a cylindrical coordinate system,resulting in inhomogeneous and anisotropic parameters,and thus making experiment difficult.To solve this problem,on the basis of coordinate transformation theory,rectangular super-scatterer and su-per-absorber were studied.The required permittivity and permeability were obtained.In order to facilitate the engineering realiza-tion,the proposed rectangular super-scatterer and super-absorber were simplified.An ingenious simplification method was pro-posed,with which inhomogeneity and anisotropy were removed and only negative refractive index materials （homogeneous and isotropic）were needed.The robustness of the proposed devices was examined when loss was considered.Simulation results show good robustness.