光学学报, 2007, 27 (11): 2027, 网络出版: 2007-11-12   

各向异性超常材料的偏振分离特性

Splitting Effect in Anisotropic Metamaterial
作者单位
1 四川大学物理科学与技术学院纳光子研究所, 成都 610064
2 南京大学物理系, 南京 210093
摘要
提出了一种利用含有负介电常量和磁导率张量的各向异性超常材料实现偏振分离的方法。通过分析电磁波在无损耗各向异性超常材料中的传输性质以及透射率与入射角度的关系,分类比较了由不同符号的介电常量和磁导率张量组合而成具有不同波矢面的各向异性超常材料的偏振分离特性,比较结果表明波矢面为单叶双曲面和椭球双叶双曲面的各向异性超常材料的偏振分离特性强。前者可以实现入射波中的s分量和p分量中某一分量正折射,另一分量负折射,且在一定条件下可以同时全透射,从而实现大角度偏振分离。后者在一定条件下可实现入射波中的s分量和p分量某一分量全反射,另一分量全透射,从而实现偏振分离。最后,对从各向同性介质入射到这两种各向异性超常材料中的高斯光波的传输进行了模拟计算,结果表明这两种各向异性超常材料可以实现很好的偏振分离功能,有潜力成为新型的偏振分离元件。
Abstract
An anisotropic metamaterial (AMM) with negative permeability and permittivity tensors is proposed for polarized-beam splitting. By analysis of the propagation of electromagnetic wave in the lossless anisotropic metamaterial and the dependence of transmissivity on the incident angle, the polarized-beam splitting characteristics of the anisotropic metamaterial with different wave-vector surface depended on the signs and magnitude of the permeability and permittivity tensors are investigated. Based on the analysis, the anisotropic metamaterials with single-lobe hyperboloid wave-vector surface and ellipsoid and double-lobe hyperboloid wave-vector surface are considered as the favorable candidates for polarized-beam splitting. The former can realize the p component or s component positive refraction and the other component negative refraction. Meanwhile, total transmission can exist under some conditions. The latter can realize one component of incident wave total reflection and the other component total transmission under some conditions. The numerical simulations about the propagation of a Gaussian beam from an isotropic regular material in these two anisotropic metamaterials are performed, and the results show that these two anisotropic metamaterials can realize polarized-beam splitting and have the potential to be a new polarized-beam splitter.

李剑峰, 罗海陆, 郭永康, 高福华, 姚欣. 各向异性超常材料的偏振分离特性[J]. 光学学报, 2007, 27(11): 2027. 李剑峰, 罗海陆, 郭永康, 高福华, 姚欣. Splitting Effect in Anisotropic Metamaterial[J]. Acta Optica Sinica, 2007, 27(11): 2027.

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