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arXiv 0909.1474physics.opticsphysics.comp-ph
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各向同性和无衍射光学超材料

Isotropic and non-diffracting optical metamaterials

Thomas Paul, Christoph Menzel, Carsten Rockstuhl, Falk Lederer

摘要:

光学超材料具有随意控制光的流动的潜力,这可能导致作为完美透镜或隐身设备的壮观应用。这两种光学元件都要求成像过程中涉及的所有空间频率的不变的有效材料特性(介电常数,磁导率)。然而,事实证明,由于当前超材料的介观性质,空间色散阻止满足这一要求;使它们远离可用于成像的目的。这个问题的解决方案并不是直接的,因为超材料通常是正向设计的;这意味着光学特性只针对特定的超材料进行评估。在这里,我们解除这些限制。系统地,我们提出了一个程序来设计具有预定义的光传播特性的超材料。在光学上,我们表明,超材料可以进行优化,使它们表现出各向同性的响应或允许无衍射传播。

英文摘要:

Optical metamaterials have the potential to control the flow of light at will which may lead to spectacular applications as the perfect lens or the cloaking device. Both of these optical elements require invariant effective material properties (permittivity, permeability) for all spatial frequencies involved in the imaging process. However, it turned out that due to the mesoscopic nature of current metamaterials spatial dispersion prevents to meet this requirement; rendering them far away from being applicable for the purpose of imaging. A solution to this problem is not straightforwardly at hand since metamaterials are usually designed in forward direction; implying that the optical properties are only evaluated for a specific metamaterial. Here we lift these limitations. Methodically, we suggest a procedure to design metamaterials with a predefined characteristic of light propagation. Optically, we show that metamaterials can be optimized such that they exhibit either an isotropic response or permit diffractionless propagation.

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