Optical anisotropic metamaterials: Negative refraction and focusing
Optical anisotropic metamaterials: Negative refraction and focusing
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DOI：
10.1103/physrevb.79.245127
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发表时间：
2009-06-01
影响因子：
3.7
通讯作者：
Soukoulis, Costas M.
中科院分区：
文献类型：
--
作者：
Fang, Anan;Koschny, Thomas;Soukoulis, Costas M.
我们设计了具有不同结构的三维金属纳米线介质，并通过数值计算证明了它们的色散关系是双曲线的，从而证明了它们可以是均匀有效的不确定各向异性介质。对于有限平板，利用一个很好的拟合过程，以获得色散关系，我们检索的有效折射率。真实的3D线介质的伪聚焦与具有线介质的有效介电常数张量的均匀介质非常一致。研究还表明，在长波长极限下，三维线介质的双曲色散关系即使对于倏逝模也是有效的。
We design three-dimensional (3D) metallic nanowire media with different structures and numerically demonstrate that they can be homogeneous effective indefinite anisotropic media by showing that their dispersion relations are hyperbolic. For a finite slab, a nice fitting procedure is exploited to obtain the dispersion relations from which we retrieve the effective permittivities. The pseudo focusing for the real 3D wire medium agrees very well with the homogeneous medium having the effective permittivity tensor of the wire medium. Studies also show that in the long-wavelength limit, the hyperbolic dispersion relation of the 3D wire medium can be valid even for evanescent modes.