Bianisotropy and Magnetism in Plasmonic Gratings
Bianisotropy and Magnetism in Plasmonic Gratings
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DOI：
10.1021/acsphotonics.6b00206
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发表时间：
2016-04
期刊：
影响因子：
7
通讯作者：
M. Kraft;A. Braun;Yu Luo;S. Maier;J. Pendry
中科院分区：
文献类型：
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作者：
M. Kraft;A. Braun;Yu Luo;S. Maier;J. Pendry
我们提出了一种简单的设计，可以在可见波长下实现双各向异性：由金光栅制成的超薄等离子体光栅，金光栅上覆盖有一层薄薄的平坦金层。我们通过实验和模拟表明，光栅表现出磁电耦合，并具有不对称反射和吸收的特性，所有这些都在器件厚度为工作波长的十分之一的情况下实现。我们比较了光谱结果并检索了不同偏振和器件的有效材料参数。我们表明，为了在超表面中获得不对称光学行为，入射光和光学相互作用表面之间的不对称性和强耦合是必需的。
We present a simple design to achieve bianisotropy at visible wavelengths: an ultrathin plasmonic grating made of a gold grating covered by a thin flat layer of gold. We show experimentally and through simulations that the grating exhibits magnetoelectric coupling and features asymmetric reflection and absorption, all that with a device thickness of a tenth of the operating wavelength. We compared the spectral results and retrieved the effective material parameters of different polarizations and devices. We show that both asymmetry and strong coupling between the incoming light and the optically interacting surfaces are required for obtaining asymmetric optical behavior in metasurfaces.