Metal-dielectric metamaterials for transformation-optics and gradient-index devices at visible wavelengths
Metal-dielectric metamaterials for transformation-optics and gradient-index devices at visible wavelengths
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发表时间：
2012
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通讯作者：
A. Rottler;D. Diedrich;D. Heitmann;S. Mendach
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作者：
A. Rottler;D. Diedrich;D. Heitmann;S. Mendach
我们从理论上研究了一种由周期性排列的银球镶嵌在PMMA基质中的光学超材料。我们证明这种超材料可以用来制作工作在可见光波长的圆柱形隐形装置。这种超材料利用了金属纳米粒子之间的等离子体相互作用的可调性，这种相互作用依赖于距离和大小。该概念也适用于各向同性介电常数分布的梯度折射率器件。我们为光学黑洞展示了这一点。
We theoretically investigate an optical metamaterial consisting of periodically arranged silver spheres embedded in a host medium of PMMA. We demonstrate that this metamaterial can be used to fabricate a cylindrical cloaking device operating at visible wavelengths. The presented metamaterial utilizes the tunability of the plasmonic interactions between the metallic nanoparticles which depend on distance and size. The presented concept is also applicable to gradient-index devices with an isotropic permittivity distribution. We show this for the optical black hole.