Revisiting substrate-induced bianisotropy in metasurfaces
Revisiting substrate-induced bianisotropy in metasurfaces
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DOI：
10.1103/physrevb.91.195304
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发表时间：
2015-05-07
影响因子：
3.7
通讯作者：
Simovski, C.
中科院分区：
文献类型：
--
作者：
Albooyeh, M.;Alaee, R.;Simovski, C.
最近，研究表明，沉积在高折射率衬底上的等离子体纳米球亚表面需要双各向异性磁电耦合才能有效地描述它。这种效应被称为衬底诱导的双各向异性。它导致了类似于双各向异性准表面的不对称反射。在这项工作中，通过一个电路模型，我们证明了这种双各向异性并不一定出现在所有衬底亚表面上。事实上，我们发现亚表面的厚度对于遇到衬底诱导的双各向异性起着至关重要的作用。此外，利用衬底诱导的双各向异性，我们给出了电路模型参数补偿由本征双各向异性亚表面产生的非对称反射的必要条件。最后，我们表示，在衬底准表面中，非对称反射和双各向异性响应是两个独立的问题，尽管是相互依赖的。
Recently, it has been shown that a metasurface of plasmonic nanospheres deposited on a highly refractive substrate requires a bianisotropic magnetoelectric coupling for its effective description. The effect has been coined substrate-induced bianisotropy. It leads to an asymmetric reflectance similar to bianisotropic metasurfaces. In this work, through a circuit model, we show that such bianisotropy does not necessarily emerge for all substrated metasurfaces. Indeed, we show that the thickness of the metasurface plays a crucial role to encounter substrate-induced bianisotropy. Moreover, by taking advantage of substrate-induced bianisotropy, we present the necessary conditions for the circuit model parameters to compensate the asymmetric reflectance generated by an intrinsically bianisotropic metasurface. We finally express that, in substrated metasurfaces, the asymmetric reflectance and the bianisotropic response are two separate issues albeit with interdependencies.