Toroidal Dipolar Response in Metamaterials Composed of Metal–Dielectric–Metal Sandwich Magnetic Resonators

Toroidal Dipolar Response in Metamaterials Composed of Metal–Dielectric–Metal Sandwich Magnetic Resonators
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由金属-电介质-金属夹层磁共振器组成的超材料中的环形偶极响应

DOI:
10.1109/jphot.2016.2574865
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发表时间:
2016-06
影响因子:
2.4
通讯作者:
Chenghua Sui
Chenghua Sui
中科院分区:
工程技术4区
文献类型:
--
作者:
Fanxin Liu;Fanxin Liu;Chenghua Sui;Chenghua Sui

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超环面材料由于其独特的电磁特性和广泛的应用前景,近年来引起了人们的广泛关注。在这项工作中,我们数值研究了单位胞包含三个磁谐振器的超材料在光频下的环形偶极响应。磁谐振器是由两个Ag棒和一个SiO2间隔层组成的金属-介质-金属三明治纳米结构。它们具有相同的形状和尺寸,但它们被放置在不同的位置,以打破空间反演对称性。磁谐振器之间的近场等离子体激元耦合导致环形偶极模式的激发,其特征在于磁谐振器内的磁偶极子的头到尾分布。在我们设计的超材料中,只需要在入射光的偏振方向上发生空间反转对称破缺,光就可以正常入射到超材料上。
Toroidal metamaterials have been drawing increasing interest recently because of their unusual electromagnetic properties and a variety of potential applications. In this work, we have investigated numerically toroidal dipolar response at optical frequency in metamaterials whose unit cell includes three magnetic resonators. The magnetic resonators are metal-dielectric-metal sandwich nanostructures, which are composed of two Ag rods and a SiO2 spacer. They have the same shape and dimension, but they are placed at different positions to break the space-inversion symmetry. The near-field plasmon coupling between magnetic resonators leads to the excitation of a toroidal dipolar mode, which is characterized by a head-to-tail distribution of magnetic dipoles within magnetic resonators. In our designed toroidal metamaterials, space-inversion symmetry breaking is needed only in the polarization direction of incident light, and light can be normally incident on the toroidal metamaterials.
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