介电常数近零材料的光学辐射增强  

Optical Radiation Enhancement via ε-Near-Zero Materials

作　　者：陈鸿莉 陈敏 CHEN Hongli;CHEN Min(School of Sciences,Nantong University,Nantong 226019,China)

机构地区：[1]南通大学理学院

出　　处：《南通大学学报（自然科学版）》2019年第3期58-63,共6页Journal of Nantong University(Natural Science Edition)　

基　　金：国家自然科学基金项目(11847033);南通大学自然科学基金项目(3081149)

摘　　要：采用各向异性磁导率近零介电常数壳层的柱形结构来实现光学辐射的增强。首先,建立研究壳层磁导率各向异性柱形结构光学散射的全波电磁散射理论;然后,通过调节柱形结构核层介电常数、壳层磁导率分别观察各向同性壳层柱形结构和各向异性壳层柱形结构功率增强因子的变化规律,并将各向同性壳层柱形结构的电场与各向异性壳层柱形结构的电场进行比较。研究结果表明:增大各向同性柱形结构壳层的磁导率,以及增大各向异性壳层柱形结构核层介电常数,可以使柱形结构的光学辐射得到加强,并且实现光学辐射增强的内半径得以减小;此外,文章研究的各向异性壳层柱形结构的电场比各向同性壳层柱形结构电场更大更稳定,从而各向异性壳层柱形结构具有更好的可调性和稳定性。A method to enhance the optical radiation by the cylinders with the shell of anisotropic permeability and ε-near-zero materials is proposed.First of all,the full-wave electromagnetic scattering theory was established to study the optical scattering of the anisotropic cylinder.And then,the permittivity and the permeability of the cylinder were adjusted to observe the change of the power enhancement factor,and the differences of the electric fields between the isotropic and anisotropic cylinders were analyzed.It is found that the power enhancement factors can be enhanced by increasing the permeability of the shell for the isotropic cylinders and the permittivity of the core for the anisotropic cylinders.And compared with the isotropic cylinders,the distributions of the electric fields under the anisotropic cylinders are larger and more stable in this article.Thus,the anisotropic cylinders have better tunability and stability.

关 键 词：介电常数近零材料 各向异性 全波电磁散射理论 功率增强因子 

分 类 号：O431.1[机械工程—光学工程]