Directed subwavelength imaging using a layered metal-dielectric system
Directed subwavelength imaging using a layered metal-dielectric system
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DOI：
10.1103/physrevb.74.115116
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发表时间：
2006-09-01
影响因子：
3.7
通讯作者：
Tsai, D. P.
中科院分区：
文献类型：
--
作者：
Wood, B.;Pendry, J. B.;Tsai, D. P.
我们研究了由交替的金属和电介质薄层组成的超材料的一些光学特性。我们可以将这种材料建模为具有各向异性介电常数的均匀有效介质。当该介电常数的分量具有不同的符号时，系统的行为变得非常有趣：P偏振入射场的正常倏逝部分现在被透射，并且存在优选的传播方向。我们表明，这种材料的板可以形成亚波长细节的图像，在一个位置，这取决于所使用的光的频率。图像的质量受到吸收和层的有限宽度的影响;我们超越有效介质近似来预测层需要多薄才能获得亚波长分辨率。
We examine some of the optical properties of a metamaterial consisting of thin layers of alternating metal and dielectric. We can model this material as a homogeneous effective medium with anisotropic dielectric permittivity. When the components of this permittivity have different signs, the behavior of the system becomes very interesting: the normally evanescent parts of a P-polarized incident field are now transmitted, and there is a preferred direction of propagation. We show that a slab of this material can form an image with subwavelength details, at a position which depends on the frequency of light used. The quality of the image is affected by absorption and by the finite width of the layers; we go beyond the effective-medium approximation to predict how thin the layers need to be in order to obtain subwavelength resolution.