Asymptotics for metamaterials and photonic crystals.

Asymptotics for metamaterials and photonic crystals.
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DOI:
10.1098/rspa.2012.0533
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发表时间:
2013-04-08
期刊:
Proceedings. Mathematical, physical, and engineering sciences
影响因子:
--
通讯作者:
Guenneau S
Guenneau S
中科院分区:
其他
文献类型:
--
作者:
Antonakakis T;Craster RV;Guenneau S

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超材料和光子晶体结构是现代光学的核心,通常由多个基本重复单元创建。我们演示了如何替换这样的结构渐近连续,因此由一组方程,捕捉潜在的高频波传播通过周期性介质的行为。我们使用的高频均匀化恢复了低频长波长极限下的经典均匀化系数。该理论是专门在电磁学中开发的二维正方形晶格,其中每个单元包含一个任意孔,在其表面上具有Neumann边界条件,并在圆柱体和开口环谐振器中进行数值计算。说明性的数值例子包括通过全角度负折射透镜,以及全向天线,内窥镜和隐形效果。我们还强调了选择正确的布里渊区的重要性,以及根据所选择的路径可能会错过有趣的物理效应。
Metamaterial and photonic crystal structures are central to modern optics and are typically created from multiple elementary repeating cells. We demonstrate how one replaces such structures asymptotically by a continuum, and therefore by a set of equations, that captures the behaviour of potentially high-frequency waves propagating through a periodic medium. The high-frequency homogenization that we use recovers the classical homogenization coefficients in the low-frequency long-wavelength limit. The theory is specifically developed in electromagnetics for two-dimensional square lattices where every cell contains an arbitrary hole with Neumann boundary conditions at its surface and implemented numerically for cylinders and split-ring resonators. Illustrative numerical examples include lensing via all-angle negative refraction, as well as omni-directive antenna, endoscope and cloaking effects. We also highlight the importance of choosing the correct Brillouin zone and the potential of missing interesting physical effects depending upon the path chosen.
DOI: 10.1103/physrevb.86.115130
发表时间: 2012-09-21
期刊: PHYSICAL REVIEW B
影响因子: 3.7
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